Best Herbs for Sleep: What the Research Actually Says

If you’ve ever stared at the ceiling at 2 a.m., you’re not alone. The CDC estimates that roughly one in three American adults doesn’t get enough sleep (CDC, 2022). And while prescription sleep medications work, they come with well-documented side effects — dependency risk, morning grogginess, and rebound insomnia among them.

So it’s no surprise that more people are turning to herbs for sleep. But which ones actually have research behind them, and which are mostly folklore? I dug into the clinical literature on eight popular herbal sleep aids to find out. Some have surprisingly solid evidence. Others are more promising than proven. Here’s what the science actually says.

Key Takeaways

• Valerian root is the most-studied herbal sleep aid, with meta-analyses showing modest improvements in subjective sleep quality
• Passionflower performed comparably to a prescription sedative in one clinical trial, with fewer side effects
• Lavender (oral Silexan) has some of the strongest clinical evidence, particularly for anxiety-related sleep issues
• Most herbal sleep aids work best for mild sleep difficulties — they are not replacements for treating underlying sleep disorders
• Combining herbs (chamomile + passionflower + lemon balm) may be more effective than single herbs alone

The 8 Best Herbs for Sleep, Ranked by Evidence

Not all herbal sleep aids are created equal. Below, I’ve organized these eight herbs roughly by the strength and volume of their clinical evidence, though I should note that even the best-studied herbs here have far less research behind them than pharmaceutical sleep aids.

1. Valerian Root (Valeriana officinalis)

Valerian is the most extensively studied herbal sleep aid in Western medicine. The root contains valerenic acid, which appears to inhibit the breakdown of GABA — the neurotransmitter that calms neural activity and helps you wind down.

A 2006 meta-analysis of 16 randomized controlled trials found that valerian may improve subjective sleep quality without producing significant side effects (Bent et al., Am J Med, 2006). A more recent 2020 systematic review of 60 studies confirmed modest benefits for sleep quality, particularly in populations with self-reported insomnia, though the authors noted that study quality was often low (Shinjyo et al., J Evid Based Integr Med, 2020).

How to use it: 300–600 mg of a standardized root extract, taken 30–60 minutes before bed. Valerian works best with consistent use over 2–4 weeks rather than as a one-night fix. Fair warning: it smells terrible. Capsules are the way to go unless you enjoy the aroma of old gym socks.

If you prefer to make your own preparation, our complete guide to making herbal tinctures walks you through the process step by step.

2. Lavender (Lavandula angustifolia)

Lavender’s reputation as a calming herb is ancient, but the modern research is actually quite compelling — particularly for the oral supplement Silexan (marketed as Lavela WS 1265 in some countries).

A 2019 meta-analysis of 11 RCTs found that lavender aromatherapy significantly improved sleep quality as measured by the Pittsburgh Sleep Quality Index (Kaiyo et al., J Altern Complement Med, 2019). The oral supplement Silexan (80 mg/day) has been studied in multiple trials for anxiety, with secondary sleep outcomes showing meaningful improvement. A 2014 RCT found Silexan comparable to lorazepam (a benzodiazepine) for generalized anxiety and associated sleep disturbance (Kasper et al., Int J Neuropsychopharmacol, 2014).

How to use it: 80 mg oral Silexan supplement daily, or diffuse lavender essential oil in the bedroom 30 minutes before sleep. Do not ingest essential oils directly — oral lavender supplements use a specially prepared form. For aromatherapy, 3–5 drops in a diffuser is sufficient.

3. Passionflower (Passiflora incarnata)

Passionflower is one of my personal favorites for evening tea because it’s gentle, pleasant-tasting, and has a mechanism that makes pharmacological sense. The flavonoids in passionflower — particularly chrysin — appear to bind GABA-A receptors and increase overall GABA levels in the brain.

The most notable clinical trial is a 2001 double-blind study that compared passionflower extract to oxazepam (a benzodiazepine) in 36 patients with generalized anxiety. Passionflower performed comparably for reducing anxiety and improving sleep quality, but with significantly fewer side effects — particularly less daytime drowsiness (Akhondzadeh et al., J Clin Pharm Ther, 2001). A 2011 RCT found that passionflower tea (one cup before bed for seven days) improved subjective sleep quality versus placebo (Ngan & Conduit, Phytother Res, 2011).

How to use it: 1–2 cups of passionflower tea in the evening, or 250–500 mg extract 30 minutes before bed. Tinctures are also effective — see our tincture-making guide for instructions.

4. Ashwagandha (Withania somnifera)

The species name somnifera literally means “sleep-inducing,” and ashwagandha has been used in Ayurvedic medicine for centuries as a sleep aid. Modern research suggests it works primarily by reducing cortisol and anxiety rather than through direct sedation.

A 2019 double-blind RCT of 60 participants found that 300 mg of ashwagandha root extract twice daily significantly improved sleep quality and sleep onset latency compared to placebo, as measured by actigraphy (wrist-worn sleep tracking) and the Pittsburgh Sleep Quality Index (Langade et al., Cureus, 2019). A 2021 systematic review of five RCTs confirmed a small but significant benefit for sleep, particularly in participants who also had anxiety (Cheah et al., PLoS One, 2021).

How to use it: 300–600 mg of a standardized root extract (look for KSM-66 or Sensoril extracts, which are the most studied). Take in the evening, with or without food. Effects typically build over 2–6 weeks.

5. Chamomile (Matricaria chamomilla)

Chamomile is probably the most widely consumed herbal sleep aid in the world, even if most people drinking it don’t think of it that way. The key compound is apigenin, a flavonoid that binds to benzodiazepine receptors on GABA-A — the same receptors targeted by drugs like Valium, though far more gently.

A 2016 RCT of 40 postnatal women found that chamomile tea consumption for two weeks significantly improved sleep quality and depressive symptoms compared to the control group (Chang & Chen, J Adv Nurs, 2016). A 2019 study of 60 elderly participants found that 200 mg chamomile extract twice daily improved sleep quality (Adib-Hajbaghery & Mousavi, Complement Ther Clin Pract, 2017).

I’ll be honest: the individual studies on chamomile are often small and not always well-designed. The evidence is modest. But chamomile is extremely safe, pleasant to drink, and inexpensive — which is why it remains a staple.

How to use it: 1–2 cups of chamomile tea in the evening (steep for 5–10 minutes with a lid to keep volatile oils in), or 200–270 mg chamomile extract in capsule form.

6. Lemon Balm (Melissa officinalis)

Lemon balm has been used in European herbal medicine since at least the Middle Ages, and it’s a lovely, lemony herb that grows readily in most gardens. Its primary mechanism appears to involve inhibiting GABA transaminase, the enzyme that breaks down GABA, thereby increasing GABA availability.

A 2011 study found that 600 mg of lemon balm extract improved mood and calmness, with secondary improvements in self-reported sleep (Kennedy et al., Pharmacol Biochem Behav, 2003). The combination of lemon balm and valerian has been studied more extensively: a 2006 multicenter study of 918 children found that the combination significantly improved insomnia symptoms in 81% of participants, with very good tolerability (Muller & Klement, Phytomedicine, 2006).

The honest assessment: lemon balm on its own has limited sleep-specific evidence. It shines brightest as a synergistic partner with other herbs, especially valerian.

How to use it: 300–600 mg extract, or a generous handful of fresh or dried leaves in tea. Combines beautifully with chamomile. Often available as a tincture as well.

7. Reishi Mushroom (Ganoderma lucidum)

Reishi is traditionally known as the “mushroom of immortality” in Chinese medicine, and it’s been used for calming the spirit (an-shen) for over 2,000 years. Modern research is starting to reveal why it might actually work for sleep.

A 2021 study published in Nature subsidiary journals identified a novel mechanism: ganoderic acids in reishi appear to modulate the gut-serotonin pathway, reducing sleep latency (the time it takes to fall asleep) in animal models. The researchers found that reishi extract altered gut microbiota composition, increasing serotonin precursors that cross the blood-brain barrier and promote melatonin synthesis (Yao et al., Pharmacol Res, 2021). An earlier 2012 study in rats found that reishi extract significantly increased total sleep time and non-REM sleep (Cui et al., BMC Complement Altern Med, 2012).

The caveat: most reishi sleep research is preclinical (animal studies). We need more human trials. But the traditional use is extensive, and the emerging mechanism via the gut-serotonin axis is compelling. For a deep dive on this mushroom, see our full guide on reishi mushroom benefits and research.

How to use it: 1,000–3,000 mg of reishi fruiting body extract daily, or as a tea/decoction. Reishi is bitter — capsules or a blended mushroom coffee work well. You can compare reishi to other functional mushrooms in our functional mushroom comparison guide.

8. Magnolia Bark (Honokiol)

Magnolia bark has been used in traditional Chinese medicine (as Houpo) and traditional Japanese medicine (as Kampo) for centuries. The active compound honokiol is a potent binder of GABA-A receptors — and unlike many herbal compounds, this mechanism has been well-characterized in laboratory studies.

A 2012 study in Neuropharmacology demonstrated that honokiol acts as a positive allosteric modulator of GABA-A receptors, enhancing the effect of GABA without directly activating the receptor — similar in mechanism (though weaker in potency) to benzodiazepines (Bernaskova et al., Eur J Pharmacol, 2015). A 2021 trial of perimenopausal women found that magnolia bark extract (60 mg/day) improved sleep quality over 24 weeks (Mucci et al., Minerva Ginecol, 2006).

This is another herb where the pharmacological mechanism is clearer than the clinical evidence. We need larger human sleep trials, but the GABA-A binding data is encouraging.

How to use it: 200–400 mg of magnolia bark extract standardized to honokiol content, taken 30–60 minutes before bed.

Comparison Table: 8 Herbs for Sleep at a Glance

How to Build a Sleep Tea Blend

One of the most enjoyable ways to use herbs for sleep is to make your own evening tea blend. Combining multiple herbs may be more effective than any single herb alone, and the ritual of making tea itself signals to your body that it’s time to wind down.

Here’s a blend I’ve been making for the past year that combines four of the herbs above. It tastes good (this matters — you won’t stick with something that tastes like compost) and covers multiple pathways: GABA modulation, mild sedation, and anxiolytic effects.

You can adjust the proportions to your taste. If you find the blend too floral, reduce the lavender. If you want stronger sedative effects, increase the passionflower. Some people also add a pinch of valerian root, though be warned: it changes the flavor significantly (and not for the better, in my opinion).

Safety and Herb-Drug Interactions

Herbal doesn’t mean harmless. While the herbs on this list have strong safety profiles when used appropriately, there are important interactions and cautions to know about.

A general rule: If you take any prescription medications — especially sedatives, blood thinners, antidepressants, or thyroid medications — talk to your doctor or pharmacist before adding herbal sleep aids. Many of these herbs affect the same neurotransmitter systems that pharmaceutical drugs target.

The Bottom Line on Herbs for Sleep

Here’s what I tell people who ask me which herbs for sleep actually work: start with chamomile tea, because it’s safe, cheap, and pleasant. If you want something stronger, add passionflower and lemon balm to your evening tea. If you’re dealing with anxiety-related sleep issues, consider ashwagandha or oral lavender (Silexan) with your healthcare provider’s knowledge. And if you want the most research-backed option, valerian root — despite the smell — has the most data behind it.

What I don’t recommend: expecting any herb to be a magic bullet. Good sleep starts with the basics — consistent schedule, dark room, no screens before bed, limited caffeine after noon. Herbs can meaningfully support that foundation. They’re unlikely to override bad habits.

And if you’ve been struggling with sleep for more than a few weeks, please see a healthcare provider. Chronic insomnia can have underlying causes (sleep apnea, hormonal changes, medication side effects) that no amount of chamomile tea will fix.

Frequently Asked Questions