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5-HTP is the direct precursor to serotonin and is used to support sleep by bypassing the rate-limiting step of tryptophan conversion. Multiple studies support its role in improving sleep quality and duration, particularly in insomnia associated with depression or serotonin insufficiency.

Apigenin is a flavonoid found in chamomile and other plants that binds benzodiazepine receptors in the brain, producing anxiolytic and mild sedative effects. It is the primary active compound underlying chamomile's sleep-promoting properties. Preclinical evidence is strong; limited human data supports sleep quality improvement.

Ashwagandha (Withania somnifera) is an Ayurvedic adaptogen with multiple RCTs demonstrating significant improvements in sleep quality, sleep latency, and sleep efficiency in adults with insomnia. Effects are more pronounced at doses ≥600 mg/day for ≥8 weeks.

Biota seed has multiple preclinical studies demonstrating sedative-hypnotic activity in insomnia mouse models, acting via serotonergic and GABAergic systems. Its use for insomnia is one of the oldest and most consistent indications in TCM, documented over 2,000 years. Human clinical trial evidence remains very limited.

Clinical evidence supports black cohosh improving objective sleep parameters in postmenopausal women. A randomized, double-blind, placebo-controlled trial using polysomnography found significant improvements in sleep efficiency and reduced wake-after-sleep-onset duration. Effect sizes were modest and evidence is largely confined to the menopausal population.

Caffeine is one of the most robustly evidenced causes of sleep disruption. By blocking adenosine receptors, it delays sleep onset, reduces total sleep time, increases nocturnal awakenings, and suppresses slow-wave sleep. These effects are well-established in controlled trials and are dose- and timing-dependent.

Cannabidiol (CBD), the non-psychoactive cannabinoid from Cannabis sativa, has been evaluated in multiple clinical trials for insomnia. Evidence is mixed but includes an RCT showing subjective sleep improvement and improved objective sleep efficiency. It acts via CB1, GABA-A, 5-HT1A, and TRPV1 receptor neuromodulation.

German chamomile (Matricaria chamomilla) is a traditional European sedative herb with RCT evidence for improving sleep quality in insomnia. Its primary active compound apigenin binds benzodiazepine receptors. Several RCTs show improvements in Pittsburgh Sleep Quality Index (PSQI) scores.

Multiple RCTs and pilot studies demonstrate that tart cherry juice improves insomnia-related outcomes in older adults, reducing sleep onset latency, increasing total sleep time, and improving sleep efficiency. A 2025 systematic review identified six clinical studies showing improvements in sleep quality and melatonin-related indices.

Doxylamine succinate is a first-generation antihistamine (H1 antagonist) sold OTC as a short-term sleep aid. Its sedative effects are well-characterized, and it is FDA-approved for occasional insomnia under brand names such as Unisom SleepTabs. It is intended for short-term use only due to tolerance development.

A clinical study (PMC10574255) in 21 adults with insomnia found that 800 mg nightly of Poria cocos ethanol extract significantly increased total sleep duration (327 to 357 min, p=0.014) and decreased sleep arousal, assessed by polysomnography. A 4-week RCT (n=70) with a P. cocos-containing combination supplement showed a 12.96% increase in total sleep duration and 59.94% improvement in PSQI scores.

GABA is the principal inhibitory neurotransmitter and is directly implicated in sleep regulation. Oral GABA supplementation has been studied in randomized controlled trials for insomnia, showing reductions in sleep latency and improvements in subjective sleep quality. Its GABAergic mechanism is well-established.

Traditional Chinese medicine has long employed Ganoderma for insomnia ('An-Shen' sedative effect). Preclinical studies confirm sleep-latency reduction and increased sleep duration via GABAergic and serotonergic mechanisms. A small clinical trial in 60 insomnia patients, and a neurasthenia RCT, provide initial human support.

Fructus Gardeniae has documented sedative activity and is used in TCM and Kampo formulas for insomnia and sleep disturbance. Animal research shows Gardenia jasminoides extract ameliorates sleep-deprivation-induced anxiety and behavioral deficits via hippocampal metabolomics and gut microbiota modulation. The Kampo formula kamishoyosan, containing gardenia, is specifically indicated for insomnia.

A double-blind, placebo-controlled, crossover clinical trial of 21 healthy adult men found that crocetin (a carotenoid from Gardenia jasminoides) reduced the number of wakening episodes as measured by actigraph (p=0.025) over 2 weeks. Geniposide and gardenoside have also shown sedative properties in animal models. This is the primary human evidence for this indication.

Gastrodin and p-hydroxybenzyl alcohol (HBA) from GE have demonstrated significant sleep-promoting effects in animal models, including increasing non-REM sleep time and modulating 5-HT and cytokine levels. GE is listed in the Pharmacopoeia of the PRC for insomnia, and fermented GE shows sleep-alleviation potential.

Glycine is a non-essential amino acid that improves sleep quality through thermoregulatory and neurotransmitter mechanisms. Controlled human studies with polysomnography show it reduces sleep latency, improves sleep efficiency, and shortens time to slow-wave sleep at 3 g/day.

Ho wood's near-pure linalool content supports its use for insomnia based on preclinical evidence of GABAergic-mediated sedation, reduced sleep latency, and extended sleep duration. It is used in aromatherapy for individuals with sleep disturbances, particularly via diffusion.

Hops (Humulus lupulus) strobiles have a long history of traditional use as a sedative and are reviewed in the context of sleep disorders. Clinical evidence, often in combination with valerian, supports improvements in sleep quality and latency. The German Commission E has endorsed hops for mood disturbances such as restlessness and anxiety.

Jujube (Ziziphus jujuba) seeds have been used for over 2,000 years in East Asian medicine specifically for insomnia and anxiety. Bioactive compounds spinosin and jujubosides modulate GABA-A receptors and serotonin pathways. Recent clinical and preclinical studies confirm sedative-hypnotic efficacy.

Jujubosides are triterpenoid saponins from Ziziphus jujuba seeds with established preclinical and emerging clinical evidence for sedative-hypnotic activity in insomnia. They modulate GABA-A receptors and serotonin pathways and are among the key active constituents of the traditional Chinese insomnia remedy suan zao ren.

Kava (Piper methysticum) is used in Pacific Island traditional medicine as a relaxant and is supported by RCTs and meta-analyses for anxiety-related insomnia. It modulates GABA-A receptors and reduces sleep onset latency. Evidence is strongest for stress-induced insomnia.

Kavalactones are the primary psychoactive compounds in kava (Piper methysticum) and are responsible for its anxiolytic and sedative effects. Multiple RCTs and a meta-analysis support their efficacy for anxiety-related insomnia. They modulate GABA-A receptors and sodium/calcium channels.

Multiple controlled clinical trials demonstrate that 3 g of oral glycine before bedtime improves both subjective and objective sleep quality in individuals with insomnia or insomniac tendencies. Polysomnographic studies confirm reduced sleep onset latency, shorter time to slow-wave sleep, and improved sleep efficiency. The mechanism involves peripheral vasodilation causing a drop in core body temperature that facilitates sleep initiation.

L-theanine, an amino acid found in green tea (Camellia sinensis), promotes relaxation without sedation and has clinical evidence for improving sleep quality and reducing sleep latency. It modulates serotonin, GABA, and alpha brain wave activity. Multiple RCTs support its use in insomnia and anxiety-related sleep disturbance.

L-tryptophan is an essential amino acid and the dietary precursor to serotonin and melatonin. Controlled studies support its ability to reduce sleep onset latency and improve sleep quality, especially in mild insomnia. It has been reviewed by the AASM and multiple meta-analyses for sleep use.

Lavender (Lavandula angustifolia) is used in aromatherapy and oral supplementation for anxiety and sleep disturbances. Clinical trials support its use for improving sleep quality and reducing insomnia severity. An oral lavender oil preparation (Silexan) has RCT evidence for generalized anxiety and associated sleep disturbance.

Lemon balm (Melissa officinalis) is a traditional European sedative herb used since antiquity for anxiety and sleep disturbances. Clinical research shows it reduces insomnia severity, particularly when combined with other calming herbs. It acts via GABA-transaminase inhibition and serotonin receptor modulation.

Lily bulb is officially listed in the Chinese Pharmacopoeia for insomnia. Pharmacological studies confirm sedative and hypnotic effects. The Bailemian capsule (containing lily bulb) has been studied clinically for insomnia with evidence of neurotransmitter modulation. Preclinical studies demonstrate sedative properties in animal models. It is classically prescribed for insomnia arising from restlessness and vivid dreams.

Lotus seed and plumule extracts promote sleep onset and increase NREM sleep duration in rodent models via GABAergic and serotonergic pathways. A human pilot study using a lotus seed–Rhodiola rosea combination improved sleep quality scores significantly. TCM has used lotus seed for insomnia for centuries.

Magnesium is an essential mineral involved in NMDA receptor regulation and melatonin synthesis, both relevant to sleep. Clinical studies support supplementation for improving sleep quality, efficiency, and duration, particularly in older adults or magnesium-deficient individuals.

Multiple human trials support magnolia bark for insomnia, particularly in menopausal and postpartum populations. A 634-woman multicenter RCT showed significant improvement in insomnia at 4, 8, and 12 weeks. A 24-week study in 89 menopausal women on 60 mg magnolia + 50 mg magnesium showed significant reduction in insomnia. Honokiol promotes non-REM sleep via GABA-A modulation in preclinical models.

Melatonin is a pineal hormone that regulates circadian rhythms and is one of the most studied natural sleep aids. Multiple meta-analyses show it moderately reduces sleep onset latency and increases total sleep time in insomnia patients. Effects are most consistent in older adults and those with comorbid or circadian-rhythm-related insomnia.

Semen Platycladi (P. orientalis seeds, Bai Zi Ren) has been used for approximately 2,000 years in TCM for insomnia. Preclinical studies demonstrate that seed essential oil and saponins shorten sleep onset, prolong sleep duration, and modulate 5-HT and GABA pathways in insomnia mouse models. Plant-derived extracellular vesicles from leaves also improved sleep parameters in rodents.

Passionflower (Passiflora incarnata) is used traditionally in European and North American folk medicine for anxiety and insomnia. Clinical trials have demonstrated its ability to increase total sleep time and reduce insomnia severity. Its mechanism involves GABA receptor modulation.

Polygalasaponins and other fractions from P. tenuifolia demonstrate consistent sedative-hypnotic effects in rodent insomnia models, reducing sleep latency and prolonging sleep duration via GABA, serotonin, and noradrenergic pathways. TCM has long used Yuan Zhi for insomnia and palpitations. No human RCTs on insomnia endpoints have been published.

Older clinical studies noted pregnenolone reduced insomnia in patients with stress-related conditions. Allopregnanolone, a key pregnenolone metabolite, has FDA approval (brexanolone) for postpartum depression and is known to promote sleep onset via GABA-A. Clinical trial data specifically targeting insomnia with pregnenolone are limited but ongoing.

Progesterone and its GABA-A-active metabolite allopregnanolone exert sedative and sleep-promoting effects, with the strongest evidence in peri- and postmenopausal women. An RCT of 100 Thai women with menopausal insomnia found significant PSQI improvement with oral micronized progesterone. Both sleep initiation and maintenance are affected.

A 2026 SLEEP conference 8-week parallel-group RCT (n=218 adults with chronic insomnia) found reishi mushroom extract 980 mg nightly standardised to 6% triterpenes reduced Insomnia Severity Index scores more than melatonin 5 mg. Earlier clinical analyses and a 2022 human study also showed reishi reduced sleep onset time and increased total sleep duration. Mechanism involves GABAergic modulation and HPA axis calming.

A published human pilot study (PMC 2024) evaluated a combination of Rhodiola rosea and Nelumbo nucifera extracts (750 mg/day for two weeks) in 20 adults with subthreshold insomnia and found significant improvements in ISI and PSQI scores. Rhodiola's adaptogenic reduction of stress and cortisol is proposed as the primary mechanism. The evidence is preliminary, based on a small combination-product trial without a placebo control group.

Multiple RCTs and a systematic review and meta-analysis have evaluated Rosa damascena aromatherapy for sleep quality, finding positive effects on sleep outcomes across different populations. A 2025 meta-analysis of 28 RCTs concluded Rosa damascena aromatherapy 'may have a positive effect on improving sleep quality.' A clinical trial comparing rose petal preparations also showed benefits in insomnia.

Saffron (Crocus sativus) and its active constituents crocin and safranal have RCT evidence for improving sleep quality and reducing insomnia severity. Mechanisms include serotonin reuptake inhibition and GABA receptor modulation. A large double-blind RCT has specifically evaluated its effects in adults with moderate insomnia.

In TCM, schisandra has been used for centuries to treat insomnia, palpitations, and dream-disturbed sleep by 'calming the shen (spirit).' A PubMed study (2021) showed schisandra and wine-processed schisandra promoted NREM sleep and modulated HPA axis activity to alleviate cardiovascular dysfunction associated with insomnia in rat models. TCM texts classify it as a primary herb for stress-induced sleeplessness.

Schisandrin B significantly shortens sleep latency, increases sleep duration, and improves sleeping quality indices in rodent models via elevation of the GABA/glutamate ratio and upregulation of GABA-A receptors. TCM documents Wu Wei Zi for insomnia due to heart-kidney yin deficiency for centuries. Human RCTs specifically testing schisandrins for insomnia are lacking.

Poria cocos sclerotium extract improves sleep quality in both animal models and a small human clinical trial (n=21), increasing total sleep duration and NREM sleep via GABAergic mechanisms. Pachymic acid is identified as the key active compound modulating the GABAergic system.

A. julibrissin is the most prescribed Chinese herbal medicine for insomnia in Taiwan and has substantial preclinical mechanistic evidence. Flavonol glycosides from its flowers increase pentobarbital-induced sleep duration in mice in a dose-dependent manner. Multiple constituents act on GABAergic and serotonergic pathways relevant to sleep.

Valerian root (Valeriana officinalis) has been used as a sedative in European traditional medicine for centuries and has been reviewed in numerous clinical trials. Evidence suggests it may improve sleep quality and reduce sleep latency, particularly in chronic insomnia, though study results are mixed. German Commission E has approved it for restlessness and sleep disturbances.

Withanolides are the primary bioactive steroidal lactones of Ashwagandha (Withania somnifera) associated with its adaptogenic and sleep-promoting properties. RCTs using extracts standardized to withanolides show significant improvements in insomnia severity, sleep efficiency, and sleep latency.

Zinc is a trace mineral that plays a regulatory role in melatonin metabolism and sleep-wake cycle regulation. RCTs support its use for improving sleep quality in populations with sleep disturbances including shift workers and older adults.

Amber (Hu Po) is a core TCM herb for insomnia, specifically used when sleeplessness is accompanied by palpitations, anxiety, or dream-disturbed sleep. Animal studies show succinic acid prolongs barbiturate-induced sleep in mice. No human RCTs exist for amber alone in insomnia.

Anemarrhena has long been used in TCM to address insomnia caused by 'yin-deficiency heat,' particularly in the context of menopause, fever, and nervous restlessness. It is incorporated in traditional sedative formulas and its rhizome is classified as sedative in traditional pharmacopeias. Preclinical evidence supports mild sedative and CNS-modulating activity.

Insomnia is one of the primary traditional Ayurvedic indications for Bacopa, documented in classical texts including the Indian Materia Medica. StatPearls (NIH/NCBI) lists insomnia as a main Ayurvedic indication. A human RCT (Lopresti 2021) did not show significant improvement on the Bergen Insomnia Scale versus placebo.

Insomnia appears among the documented traditional uses of butterbur in multiple pharmacognosy databases, including NCCIH government sources and RxList. No clinical trial evidence exists for this indication, and the pharmacological mechanism by which butterbur might promote sleep has not been established.

California poppy (Eschscholzia californica) has traditional use in Native American and Western herbal medicine as a mild sedative and sleep aid for insomnia and anxiety. It contains alkaloids including californidine and eschscholtzine that interact with GABA receptors. Preclinical evidence supports sedative activity; limited clinical trials exist.

Danshen has been used in TCM for at least two millennia for insomnia and restlessness, classified under the action of 'nourishing the heart to calm the mind.' This is well-documented in classical materia medica texts. Pharmacological research confirms neuroprotective and sleep-modulating properties of tanshinone IIA, though dedicated human sleep trials are absent.

Coleus forskohlii is documented in Ayurvedic medicine as a traditional remedy for insomnia and convulsions. Multiple pharmacopeial and ethnopharmacological sources confirm this use. No clinical trials in humans for insomnia specifically have been published.

Jamaican dogwood (Piscidia erythrina) is one of its primary traditional indications, particularly for insomnia driven by pain, nervous tension, or anxiety. Rodent studies support CNS depressant and sedative effects. It is listed in the British Herbal Pharmacopoeia for this use. No human clinical trials exist.

Geranium has been used traditionally as a sedative and nervine relaxant to promote sleep. A RCT in ICU nurses testing P. graveolens for sleep quality found no statistically significant effect on sleep scores, though fatigue was reduced. The sleep-promoting use remains primarily traditional.

In TCM, abalone shell is included in formulas for insomnia linked to Liver Yang rising or Liver Fire, where restlessness and inability to sleep accompany other heat signs. It is a component of the formula Tian Ma Gou Teng Yin, documented for treating dizziness and insomnia.

Hawthorn has traditional use as a mild sedative and hypnotic in European folk medicine. Animal studies demonstrate CNS depressant activity supporting this use. A 2026 systematic review and meta-analysis found a complete absence of RCT evidence for hawthorn as a standalone agent for insomnia, and available clinical data involve multi-herb combinations.

Sleeplessness is listed as a traditional indication for H. italicum in European folk medicine across Italy, Spain, Portugal, and Bosnia & Herzegovina. The mechanism is not well characterised scientifically, and no clinical trials on insomnia exist.

Inositol nicotinate appears across multiple clinical and supplement monograph sources as a traditional use for sleep problems (insomnia). RxList, WebMD, and Wikipedia list insomnia among its cited uses. However, no clinical trials specifically testing IHN for insomnia have been identified, and these sources consistently note that more evidence is needed.

Jiaogulan has traditionally been used in southern China for sleep difficulties and is listed in the RxList monograph as a traditional use for insomnia. No dedicated human RCT has been conducted for insomnia as a primary endpoint; the effect is attributed to its adaptogenic, HPA-modulating properties.

Lactucarium is the dried latex of wild lettuce (Lactuca virosa or Lactuca sativa), historically used in 19th-century European and American medicine as a sedative and hypnotic agent. Active sesquiterpene lactones including lactucin and lactucopicrin have demonstrated sedative activity. Traditional use for insomnia and restlessness is well-documented.

Lactucopicrin is a sesquiterpene lactone from wild lettuce (Lactuca spp.) responsible for part of the plant's traditional sedative and hypnotic properties. Pharmacological studies show CNS depressant activity. It is the key active compound underlying lactucarium's traditional use for insomnia.

By the 19th century, lobelia was recorded as used for insomnia as part of its broader role as a CNS relaxant and nervine in Eclectic practice. Drugs.com's historical overview lists insomnia among conditions for which lobelia was used. No clinical studies have tested this application.

Lophatherum leaf has a documented traditional role in TCM for treating restlessness and insomnia caused by 'heat agitating the Heart spirit.' Classical texts describe its calming effect on Shen (spirit) when excess heat generates irritability and disturbed sleep. No clinical or pharmacological studies specifically address insomnia outcomes.

Marjoram is documented in Moroccan folk medicine for insomnia, and its sedative properties are recognized in traditional herbalism. The 2023 aromatherapy RCT demonstrating reduced anxiety provides indirect human support for sedative-anxiolytic action.

A. vulgaris is documented in European Pharmacopoeia-recognized homeopathic preparations and multiple traditional systems for insomnia and sleep disorders including somnambulism. MAO-inhibiting phenolic compounds in the plant provide mechanistic plausibility for nervous system sedation. No human clinical sleep trials with mugwort exist.

Ophiopogon japonicus is prescribed in TCM for insomnia and irritability caused by heart yin deficiency and 'heart fire.' The herb 'clears heart fire' and 'eases the mind' according to TCM theory. It is consistently listed as a remedy for insomnia in both Chinese and Japanese Kampo medicine.

Insomnia is a consistently documented traditional indication for ophiopogon root across Chinese Pharmacopoeia, Shennong's Classic, Japanese Pharmacopoeia (16th edition), and multiple classical TCM and Kampo sources. It is prescribed for insomnia from heart yin deficiency and vexation. No human clinical sleep trials with O. japonicus monotherapy exist.

Orange blossom and peel have documented traditional use for insomnia across European, Chinese, and Middle Eastern herbal medicine. The calming effects of orange essential oil on the nervous system, documented in anxiety-related clinical studies, provide indirect support for this traditional indication.

Peach leaf is classified as mildly sedative in traditional herbalism, and the plant has been used for nervous system support including sleep-related conditions in folk medicine. This is an extension of the documented sedative/nervine properties.

Insomnia is one of the most historically documented indications for Polygala root in TCM. Animal studies show saponin fractions prolong sleep time and modulate GABA, serotonin, and norepinephrine. A small number of human observations exist, but dedicated human RCTs on insomnia as a primary endpoint are lacking.

Sedative and sleep-promoting use of poppy is documented across Unani, Ayurvedic, and Western folk medicine traditions. Opium poppy preparations were historically used to induce sleep via opioid CNS depression. Common poppy (Papaver rhoeas) contains the mild sedative alkaloid rhoeadine and has a parallel tradition as a sleep tea, particularly for children.

Insomnia is a documented traditional TCM indication for Ligustrum lucidum, attributed to its yin-nourishing properties for the liver and kidneys. MSKCC explicitly notes this use but states no clinical data support it. The traditional indications appear in multiple pharmacopoeial and ethnobotanical sources.

Raw Rehmannia (Sheng Di Huang) is prescribed in TCM for insomnia associated with Yin deficiency, characterised by restlessness, night sweats, and heat sensations. It is a core ingredient of formulas such as Tian Wang Bu Xin Dan used for heart and kidney Yin deficiency-related sleep disturbance. The Restorative Medicine apothecary monograph also notes that blood deficiency with palpitations and insomnia is a key indication.

Rehmannia is listed in multiple TCM references for blood deficiency-type insomnia presenting with heart palpitations, dizziness, and nighttime restlessness. It is combined with other blood-nourishing herbs in classical formulas for sleep disturbance. No standalone human trials for insomnia exist.

Skullcap (Scutellaria lateriflora) is a traditional North American herbal sedative used by Indigenous peoples and in Eclectic medicine for nervousness and insomnia. Flavonoids including baicalin modulate GABA-A receptors. Limited clinical evidence exists; preclinical data support sedative-anxiolytic activity.

Soursop leaves are traditionally used to treat insomnia and have sedative properties documented in ethnomedicinal literature and in early pre-clinical research. The leaves, bark, and roots of A. muricata have been used for their sedative and nervine effects.

The Menominee people of North America specifically used squawvine leaves in a drink to treat insomnia, as recorded in ethnobotanical literature. The herb is also noted in folk medicine for sedative effects attributed to its phytochemical constituents. No clinical trials exist.

St. John's Wort (Hypericum perforatum) has documented traditional use in European herbal medicine for nervous complaints and sleep disturbances. Commission E endorses it for psychovegetative disturbances including sleep disorders. Clinical evidence for insomnia is primarily in the context of depression-associated sleep disruption.

A. calamus is listed in Ayurvedic pharmacology as sedative and CNS-depressant, with traditional use for insomnia and hysteria. Animal studies confirm sedative and hypnotic properties attributable to asarone components. No human clinical trials on insomnia as a primary outcome have been identified.

Insomnia is listed among the primary traditional Ayurvedic indications for Bacopa monnieri. The herb is documented in traditional texts and ethnobotanical records as a treatment for insomnia, and some modern RCTs have reported improvements in sleep as a secondary outcome.

Wood betony is documented in traditional European and folk herbalism as a remedy for insomnia and poor sleep, especially sleep disturbed by racing thoughts or nervous tension. Its sedative and nervine actions underpin this use. No clinical trial data exist.

Yarrow has traditional use as a mild sedative and calming herb, referenced in folk medicine and cited in the published literature as used for insomnia and anxiety. Its documented GABA-A receptor activity provides a mechanistic rationale. No clinical trials on sleep endpoints have been conducted.