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These are supplements that may affect some aspect of sleep — namely, how long it takes to fall asleep, how long you stay asleep, and how restful sleep is.

Our evidence-based analysis on sleep features 144 unique references to scientific papers.

Research analysis led by and reviewed by the Examine team.
Last Updated:

Summary of Sleep

Supplements that affect sleep may act by altering the time it takes to fall asleep (sleep onset latency), the duration of continuous sleep (sleep disturbances), or the restfulness of sleep (sleep quality).

Supplements for these purposes may directly initiate sleepiness, such as melatonin; have an effect on stress and anxiety, such as valeriana officinalis; or make sleep deeper and more restful, such as glycine.

🔎 Are you looking for supplements to help you with sleep?

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Frequently Asked Questions and Articles on Sleep

How important is sleep?
Sleep is incredibly important, and can be considered crucial alongside diet and exercise. Proper sleep habits help sustain many biological processes, and bad sleep can cause these processes to be suboptimal or even malfunction.
Does ZMA cause weird dreams?
It is possible that ZMA can cause weird dreams, and the anecdotes support this; however, since this has not been directly investigated the best 'proof' that can be given is weak.
Ten tips for better sleep
To feel and perform your best, you don’t just need enough sleep, you need enough quality sleep. We break down what you can do — and what you should avoid — to sleep well and wake up refreshed.
Can supplemental vitamin D improve sleep?
Vitamin D levels seem to be correlated with sleep quality. But correlation doesn't necessarily equal causation.
How eating better can make you happier
Food and supplements that can help fight stress, fatigue, anxiety, depression, and help you sleep better.
I'm not too tired to stuff my face
This study found that total sleep deprivation leads to more calories eaten overall, but those calories were all consumed at night. Sleep deprivation did not affect the amount of calories consumed the following day.

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Click here to see all 144 references.