Sleep-onset stack — fall asleep faster
For trouble falling asleep specifically — long sleep latency, "tired but wired" arousal at bedtime, racing thoughts, or a circadian system that runs late. This is a different problem than waking at 3 a.m. (sleep-maintenance) and the stack is built around it. Layer one supplement at a time across two-week blocks so you can tell what's actually moving the needle for you.
Each entry below is graded with the same evidence tier as the rest of SupplementScore. The stack is layered into a Foundation that almost everyone with sleep-onset issues should try first, a Performance layer that targets specific arousal pathways, and Optional supplements where evidence is thinner or applies only to a subset of users.
TL;DR — the stack
| Supplement | Layer | Dose & timing | Tier |
|---|---|---|---|
| Magnesium glycinate | Foundation | 200–400 mg elemental, with dinner | Tier 1 |
| Glycine | Foundation | 3 g in warm water, 30–60 min before bed | Tier 2 |
| L-Theanine | Performance | 200–400 mg, 30–45 min before bed | Tier 2 |
| Melatonin (0.3–0.5 mg, physiological dose) | Performance | 0.3–0.5 mg, 30–60 min before bed | Tier 1 |
| Tart cherry (Montmorency) | Optional | 480 mg extract or 240 mL juice, evening | Tier 2 |
| Lavender oil oral (Silexan) | Optional | 80 mg Silexan capsule, evening | Tier 2 |
| Apigenin | Optional | 50–100 mg, 30–60 min before bed | Tier 3 |
Per-supplement detail
Dose & timing. 200–400 mg elemental magnesium with the evening meal or 30–60 min before bed.
Why. Magnesium activates GABA-A signalling and downregulates NMDA-type glutamate; the glycine ligand is itself calming. The Mah and Pitre 2021 systematic review and meta-analysis (PMID 33865376) found oral magnesium reduced sleep-onset latency by roughly 17 minutes versus placebo in older adults with insomnia, with the largest effects in those with low baseline magnesium intake.
Funder mix. Public/academic-funded trials (university hospital cohorts).
Notes. Glycinate is the form to use for sleep — citrate and oxide loosen stools at the same dose; chloride forms cause more GI distress. Do not exceed 400 mg elemental long-term without checking renal function.
Dose & timing. 3 g dissolved in warm water, 30–60 minutes before bed. Mildly sweet — easy to take.
Why. Glycine acts at glycine and NMDA-receptor co-agonist sites, lowers core body temperature (a permissive signal for sleep onset), and improves subjective sleep quality. The Bannai and Kawai 2012 review (PMID 22293292) summarised three placebo-controlled trials in healthy volunteers with mild insomnia showing 3 g pre-bed shortened sleep onset and improved next-day fatigue and clarity.
Funder mix. Industry-funded (Ajinomoto) plus independent replications.
Notes. Inexpensive, no documented drug interactions at 3 g. Does not produce next-day grogginess in trial cohorts.
Dose & timing. 200–400 mg, 30–45 minutes before bed (standalone — not paired with caffeine in this context).
Why. Theanine raises alpha-wave activity and partially modulates the NMDA receptor, lowering arousal without sedation. The Hidese et al. 2019 RCT (PMID 31623400) reported improvements in subjective sleep quality and reductions in sleep-related problems with 200 mg/day for four weeks. Effect sizes are modest but consistent for the "tired but wired" presentation.
Funder mix. Industry-funded (Taiyo) and independent.
Notes. Among the safest supplements known. Stack cleanly with magnesium glycinate and glycine — see synergies below.
Dose & timing. 0.3–0.5 mg taken 30–60 minutes before target sleep time. Use immediate-release tablets or liquid — most US gummies are 5–10 mg, which is 10–30× the physiologically effective dose and produces more next-day grogginess without added benefit.
Why. Melatonin is a circadian signal acting on MT1 and MT2 receptors. Auld et al. 2017 (PMID 28648359) and Ferracioli-Oda et al. 2013 (PMID 23691095) — both meta-analyses — report sleep-onset latency reductions of 7–15 minutes in adults with primary insomnia, with stronger effects at low physiological doses than at the 5–10 mg sold over the counter. Endogenous melatonin declines with age, so the cleanest evidence is in adults >55.
Funder mix. Public/academic and Cochrane-style independent reviews; commercial supply chain quality is mixed (Cohen et al. 2023, PMID 37097362, found gummies ranging from 74% to 347% of labelled dose — buy USP-Verified or NSF-certified).
Notes. Avoid in pregnancy or lactation; cautious use in autoimmune disease and adolescents. Interacts with sedatives, some antidepressants, and warfarin.
Dose & timing. 480 mg concentrated extract or 240 mL juice in the evening (some protocols split morning + evening).
Why. Provides small amounts of natural melatonin and procyanidins that increase tryptophan availability. Losso et al. 2018 (PMID 28901958) found Montmorency tart cherry juice improved sleep efficiency and increased total sleep time by ~84 minutes in older adults with insomnia. Effect sizes are modest and somewhat variable across formulations.
Funder mix. Mix of academic and tart-cherry industry council funding (declared in trials).
Notes. Good optional add-on if you also train hard — same compound has anti-inflammatory recovery evidence. Watch sugar load if using juice.
Dose & timing. One 80 mg Silexan capsule daily in the evening. Specifically the Silexan formulation — generic lavender oil capsules have not been tested to the same standard.
Why. The Möller et al. 2023 pooled analysis of multiple Silexan trials (PMID 36692653) found significant reductions in HAM-A anxiety scores; downstream sleep-onset improvement is consistent in subgroups whose insomnia is anxiety-driven. Best fit when racing thoughts or generalised anxiety dominate the bedtime presentation.
Funder mix. Predominantly industry-funded (Schwabe Pharmaceuticals); a head-to-head with paroxetine (Kasper 2014, PMID 24595337) supports comparability for GAD but is one trial.
Notes. Burping a mild lavender taste is the most common side effect. Combine cautiously with SSRIs or other sedatives — discuss with your prescriber.
Dose & timing. 50–100 mg standardised chamomile extract, 30–60 minutes before bed.
Why. Chamomile-derived apigenin is a partial benzodiazepine-receptor ligand with mild anxiolytic activity. Mao et al. 2016 (PMID 27912875) found chamomile extract reduced moderate-to-severe GAD symptoms over eight weeks. Direct sleep-onset trials in humans are limited — this is a Tier 3 add-on, not a foundational pick.
Funder mix. Mix of academic and supplement-industry-funded trials.
Notes. Excellent safety profile. If chamomile tea works for you, that is an even cheaper entry point.
Daily timing — when to take what
MiddayLast caffeine cutoff 14:00 (caffeine half-life is 5–7 h).
EveningMagnesium glycinate 200–400 mg with dinner. Lavender (Silexan) 80 mg if used.
Pre-bed30–60 min before lights-out: Glycine 3 g + L-Theanine 200–400 mg + Melatonin 0.3–0.5 mg (+ Apigenin 50–100 mg if used).
In bedDark, cool room (16–19°C). Phone outside the bedroom.
Within-stack synergies
The Foundation + Performance trio of magnesium glycinate + glycine + L-theanine is a documented synergy in our pairings database (entry p87, "Sleep onset + anxiety reduction"): three different cooling/inhibitory routes converge — glycine lowers core body temperature, magnesium activates GABA-A, and theanine raises alpha-wave activity. The synergy is rated strength 3 (additive, not multiplicative) but the mechanistic non-overlap is clean and the side-effect profile of all three is excellent.
Low-dose melatonin layers on top because it acts at MT1/MT2 receptors — a circadian signal, not a sedative. No documented adverse interaction with the GABAergic trio above.
Interactions to watch
- Sedating prescription drugs. Pairing this stack with benzodiazepines, opioids, gabapentinoids (gabapentin, pregabalin), Z-drugs (zolpidem), or first-generation antihistamines is additive CNS depression — pairing entry p133 in our database flags glycine and melatonin specifically. If you take any of these, build the stack only with prescriber input.
- Warfarin / blood thinners. Melatonin has documented warfarin interaction — INR can shift either way. Hold melatonin until cleared by your anticoagulation clinic.
- SSRIs / SNRIs. Lavender oil oral (Silexan) is on our caution list with serotonergic prescriptions — additive sedation and theoretical serotonergic effect. Discuss with your prescriber before adding.
- Levothyroxine. Magnesium chelates levothyroxine — separate dosing by ≥4 hours (take thyroid first thing in the morning, magnesium with dinner).
- PPIs (omeprazole, lansoprazole). Long-term PPI use depletes magnesium and increases need for chelated forms — glycinate is the right choice.
- Untreated sleep apnea. Sedating supplements can worsen apnea-related desaturations. Get a sleep study before relying on a sleep stack if you snore loudly or have witnessed apneas.
Don't bother — what to skip
These are commonly marketed for sleep onset but the evidence does not hold up.
- Valerian root. The Leach and Page 2015 systematic review (PMID 25644982) of 16 trials concluded valerian for insomnia is "currently insufficient" with high heterogeneity and no consistent benefit over placebo. Older Bent et al. 2006 meta-analysis (PMID 17145239) reached similar conclusions. Mild liver injury cases reported.
- GABA (oral supplement). Oral GABA does not reliably cross the blood-brain barrier in adults. Boonstra et al. 2015 (PMID 26500574) reviewed the evidence and found weak, inconsistent effects unlikely to be central. Whatever calming effect users perceive is probably peripheral.
- CBD (over-the-counter wellness products). Retail CBD products typically dose at 5–25 mg per serving. The trials that found anxiolytic and sleep effects used 25–600 mg of pharmaceutical-grade CBD — far above retail formulations. The Bonn-Miller et al. 2017 JAMA analysis (PMID 29114823) also found 70% of US retail CBD products were mislabelled. Save your money for the stack above.
- 5-HTP for sleep. Limited sleep-specific evidence and serious serotonin-syndrome risk if combined with SSRIs, SNRIs, MAOIs, or migraine triptans. Turner et al. 2006 (PMID 16716172) reviewed the evidence and noted the safety concerns specifically. Don't use as a routine sleep aid.
Sources
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. BMC Complement Med Ther. 2021;21:125. PMID: 33865376.
- Bannai M, Kawai N. New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep. J Pharmacol Sci. 2012;118(2):145–148. PMID: 22293292.
- Hidese S, Ogawa S, Ota M, et al. Effects of L-theanine administration on stress-related symptoms and cognitive functions in healthy adults: a randomized controlled trial. Nutrients. 2019;11(10):2362. PMID: 31623400.
- Auld F, Maschauer EL, Morrison I, et al. Evidence for the efficacy of melatonin in the treatment of primary adult sleep disorders. Sleep Med Rev. 2017;34:10–22. PMID: 28648359.
- Ferracioli-Oda E, Qawasmi A, Bloch MH. Meta-analysis: melatonin for the treatment of primary sleep disorders. PLoS One. 2013;8(5):e63773. PMID: 23691095.
- Cohen PA, Avula B, Wang YH, et al. Quantity of melatonin and CBD in melatonin gummies sold in the US. JAMA. 2023;329(16):1401–1402. PMID: 37097362.
- Losso JN, Finley JW, Karki N, et al. Pilot study of the tart cherry juice for the treatment of insomnia and investigation of mechanisms. Am J Ther. 2018;25(2):e194–e201. PMID: 28901958.
- Möller HJ, Volz HP, Dienel A, et al. Efficacy of Silexan in mild-to-moderate major depressive disorder and generalized anxiety disorder: pooled analysis. Wien Med Wochenschr. 2023. PMID: 36692653.
- Kasper S, Gastpar M, Müller WE, et al. Lavender oil preparation Silexan is effective in generalized anxiety disorder — a randomized, double-blind comparison to placebo and paroxetine. Int J Neuropsychopharmacol. 2014;17(6):859–869. PMID: 24595337.
- Mao JJ, Xie SX, Keefe JR, et al. Long-term chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: a randomized clinical trial. Phytomedicine. 2016;23(14):1735–1742. PMID: 27912875.
- Leach MJ, Page AT. Herbal medicine for insomnia: a systematic review and meta-analysis. Sleep Med Rev. 2015;24:1–12. PMID: 25644982.
- Bent S, Padula A, Moore D, et al. Valerian for sleep: a systematic review and meta-analysis. Am J Med. 2006;119(12):1005–1012. PMID: 17145239.
- Boonstra E, de Kleijn R, Colzato LS, et al. Neurotransmitters as food supplements: the effects of GABA on brain and behavior. Front Psychol. 2015;6:1520. PMID: 26500574.
- Bonn-Miller MO, Loflin MJE, Thomas BF, et al. Labeling accuracy of cannabidiol extracts sold online. JAMA. 2017;318(17):1708–1709. PMID: 29114823.
- Turner EH, Loftis JM, Blackwell AD. Serotonin a la carte: supplementation with the serotonin precursor 5-hydroxytryptophan. Pharmacol Ther. 2006;109(3):325–338. PMID: 16716172.