Part of our Turmeric & Curcumin guide library.
Short answer: Warm milk may help a little as part of a calming bedtime routine, but the evidence that milk itself makes you sleep is weak. A 2020 review of 14 studies found that the effects of milk and dairy on sleep were small and that most studies were low quality. The famous reason, tryptophan, does not hold up well: a cup of milk has only about 0.1 gram, and other proteins in milk compete with it to reach the brain. If a warm mug helps you wind down, it is a reasonable habit; just keep it small, skip caffeine-containing cocoa late at night, and watch for stomach upset if you are lactose intolerant.
Warm milk before bed is one of the oldest sleep tips around. It is cheap, comforting and caffeine-free, but does it actually work? Here is what studies show about milk and sleep, why the tryptophan story is weaker than it sounds, whether warm beats cold, and what to try instead. We sell a turmeric drink mix that many people make into golden milk, so we point out where our product comes in and where the research does not cover it.
What you'll learn
- What studies show about milk and sleep
- Why warm milk might make you sleepy, and how much tryptophan it really has
- Whether warm milk works better than cold milk, or with honey
- When to drink it, and who should skip it
- Whether golden milk helps you sleep
Does warm milk help you sleep?
It might help a little, mostly as part of a relaxing routine, but there is no strong evidence that milk itself improves sleep. A 2020 systematic review looked at 14 studies with 10,833 participants. The authors concluded that a well-balanced diet that includes milk and dairy may improve sleep quality, despite mixed results, but in the randomized trials any benefits were limited and small, and 7 of the 10 clinical studies were rated low quality (Komada et al., 2020). The review was funded by a dairy industry association.
Just as important, the review found no study testing plain warm milk on its own. The warm-milk studies it included used a malted milk drink mixed into hot milk (Komada et al., 2020).
Why does warm milk make you sleepy?
There are three common explanations, and only one of them has much going for it:
| Explanation | What the evidence says |
|---|---|
| Tryptophan in milk makes you drowsy | Weak. A cup has only about 0.1 g, and other amino acids compete with it (see below) |
| Milk contains melatonin | Weak. Ordinary milk has very little; "night milk" studies in people were not convincing (Valtonen et al., 2005) |
| A warm, familiar ritual helps you wind down | Plausible. NHLBI suggests quiet time and relaxation before bed (NHLBI), and warmth before bed has some support (Haghayegh et al., 2019) |
In other words, the comfort of a warm drink and a quiet routine may matter more than anything in the milk.
Is there enough tryptophan in milk to make you sleepy?
Probably not. Tryptophan is an amino acid the body uses to make serotonin and melatonin. Whole milk has 0.04 g of tryptophan per 100 g, and a cup weighs 244 g (USDA FoodData Central), so a cup has about 0.1 g, by our calculation.
Tryptophan also has to compete with other large amino acids to get into the brain (Fernstrom, 2013). When people ate more protein, their blood tryptophan actually fell relative to those competing amino acids (Fernstrom et al., 1979). Milk is a protein food, so it brings the competitors along with the tryptophan.
Studies that found effects used much more concentrated tryptophan:
- A 2022 meta-analysis of tryptophan supplements found they reduced time spent awake after first falling asleep, but did not improve other measures of sleep. Studies were grouped by doses of under 1 gram or 1 gram or more a day (Sutanto et al., 2022).
- In a study of 28 adults, an evening serving of a whey protein specially enriched in tryptophan raised the tryptophan ratio in the blood by 130% and reduced sleepiness the next morning (Markus et al., 2005). That was a concentrated protein, not a glass of milk.
Does milk contain melatonin?
A little, and more if the cow is milked at night, but there is no good evidence that this helps people sleep. In a rat study, milk collected at 2 a.m. had about 10 times more melatonin than milk collected in the afternoon, by our calculation from the measured levels (Milagres et al., 2014). In people, two 8-week studies gave night-time milk to older adults living in care homes. Sleep changed with the seasons, but the night milk itself did not clearly improve sleep (Valtonen et al., 2005).
Does warm milk help you sleep better than cold milk?
We found no study comparing warm and cold milk for sleep. The case for warm milk is mainly that a warm drink feels soothing and fits a slow-down routine. Warmth before bed does have some research behind it in a different form: a 2019 meta-analysis found that a warm bath or shower of 40 to 42.5 °C (about 104 to 108.5 °F, by our calculation), taken 1 to 2 hours before bed for as little as 10 minutes, shortened the time it took to fall asleep (Haghayegh et al., 2019). A mug of milk is not a bath, so we cannot say it has the same effect.
Does warm milk help you fall asleep faster?
There is no good modern evidence that it does. The closest studies are from 1972: in 18 people recorded over 10 nights each, a hot malted milk drink at bedtime was linked to less restlessness late in the night in younger adults and to longer, less broken sleep in older adults, compared with an inert capsule (Brezinová & Oswald, 1972). These were small, old studies of a commercial malted drink, not plain milk.
If you want to fall asleep faster, a consistent schedule, morning light and an earlier caffeine cut-off have stronger support; see how to fix your sleep schedule.
Does warm milk with honey help you sleep?
There is very little evidence for healthy adults. In one trial of 68 people in the hospital with a heart condition, those given a milk-and-honey drink twice a day for 3 days reported better sleep quality on day 3 than those who got routine care (Fakhr-Movahedi et al., 2018). That was a small study of hospital patients, so it does not tell us much about sleep at home. Honey also adds sugar, so keep it to a small amount.
When should you drink warm milk before bed?
Our practical take: have a small cup about 30 to 60 minutes before bed, as part of the same wind-down routine each night. The NHLBI advises avoiding heavy or large meals within a few hours of bedtime, but says a light snack is okay, so a small mug fits.
Watch what you add. Hot cocoa has a little caffeine: 3 mg per 100 g, and a cup weighs 248 g (USDA FoodData Central), so about 7 mg per cup by our calculation. The NHLBI lists chocolate among caffeine sources to avoid before bed. Chai, matcha lattes and coffee-based lattes also contain caffeine; see does chai have caffeine?.
Who should skip warm milk before bed?
If you are lactose intolerant, milk at bedtime may keep you up instead. Symptoms such as bloating, gas, diarrhea and stomach pain can start within a few hours of having milk (NIDDK). Many people with lactose intolerance can handle about 12 grams of lactose, the amount in about 1 cup of milk, with no or only mild symptoms (NIDDK), and lactose-free milk is another option.
If you have a milk allergy, avoid it. Our practical take: if warm milk gives you heartburn or wakes you up to use the bathroom, try a smaller cup earlier in the evening.
Does golden milk help you sleep?
We found no studies testing golden milk (turmeric milk) for sleep. A few curcumin supplement trials have measured sleep as a side outcome in people with specific health conditions, which does not tell us much about healthy adults. Golden milk can be a pleasant caffeine-free evening drink, but there is no evidence that turmeric makes you sleepy. For recipes, see turmeric tea and golden milk and building an evening wind-down ritual.
Our product: Nano Turmeric is our mango-flavored turmeric curcumin drink mix. One sachet (5 g) is one serving, with 10 calories and no caffeine listed (Product Facts). Some people stir it into warm milk or a milk alternative as an evening drink; see our golden turmeric and mango latte. It is not a sleep aid, and we have not tested it for sleep.
Safety: the NCCIH notes that liver damage has been reported in some people using curcumin products made to be better absorbed. Stop and talk with your health care provider if you notice fatigue, nausea, poor appetite, dark urine or yellowing of the skin or eyes. NCCIH also says turmeric supplements may be unsafe during pregnancy, and some herbs and medicines interact, so check with your provider first if you take any medicine; see does turmeric thin your blood?.
What if warm milk does not help?
If you regularly have trouble sleeping, a bedtime drink is unlikely to fix it. For ongoing insomnia, the American Academy of Sleep Medicine recommends cognitive behavioral therapy for insomnia (CBT-I) and suggests that sleep tips on their own are not enough as a treatment (AASM guideline, 2021). Talk with your doctor, and see how to fix your sleep schedule for the habits with the most support.
Common myths (quick reality check)
Myth: The tryptophan in warm milk knocks you out. Reality: A cup of milk has only about 0.1 g of tryptophan (USDA FoodData Central; by our calculation), and other amino acids in milk compete with it to reach the brain (Fernstrom, 2013).
Myth: Warm milk works better than cold milk. Reality: We found no study comparing them. Any edge for warm milk likely comes from the comfort of a warm drink and routine.
Myth: Hot cocoa is a caffeine-free bedtime drink. Reality: Hot cocoa has a small amount of caffeine, about 7 mg per cup by our calculation from USDA data (USDA FoodData Central), and NHLBI lists chocolate among caffeine sources to avoid before bed (NHLBI).
Frequently asked questions (FAQ)
Does warm milk help you sleep?
It may help a little as part of a calming routine, but evidence that milk itself improves sleep is weak. A 2020 review of 14 studies found only small effects, and most studies were low quality.
Why does warm milk make you sleepy?
The usual explanation is tryptophan, but a cup of milk has only about 0.1 gram. The warmth and the wind-down ritual are more likely reasons it feels relaxing.
Is warm milk better than cold milk for sleep?
We found no study comparing them. Warm milk may feel more soothing, and a warm bath before bed does have some research support, but that is not the same as a warm drink.
Does warm milk help you fall asleep faster?
There is no good modern evidence that it does. Small studies from 1972 of a hot malted milk drink found less restless sleep, but they did not test plain milk.
Does warm milk with honey help you sleep?
One small trial in hospitalized heart patients found better sleep scores after 3 days of milk and honey. There is no good evidence for healthy adults at home.
How long before bed should I drink warm milk?
Our practical take is a small cup about 30 to 60 minutes before bed. NHLBI advises avoiding large meals before bed but says a light snack is okay.
Can I drink warm milk before bed if I am lactose intolerant?
Many people with lactose intolerance can handle about 1 cup of milk with no or mild symptoms, according to NIDDK. Lactose-free milk is another option.
Does golden milk help you sleep?
We found no studies testing golden milk for sleep. It can be a pleasant caffeine-free evening drink, but there is no evidence that turmeric makes you sleepy.
Related guides
- How to fix your sleep schedule
- Building an evening wind-down ritual
- Turmeric tea, golden milk and turmeric water
- Golden turmeric and mango latte
- How long does caffeine stay in your system?
- Does chocolate have caffeine?
- Does chai have caffeine?
- When is the best time to take turmeric?
Disclaimer and when to seek help
This article is for general education and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Our products are not intended to diagnose, treat, cure, or prevent any disease. Talk with your health care provider if you have ongoing trouble sleeping or severe daytime sleepiness, if you have a milk allergy, or before using turmeric or other supplements, especially if you are pregnant, breastfeeding or take medication.
References
- Komada Y, Okajima I, Kuwata T. "The effects of milk and dairy products on sleep: a systematic review." International Journal of Environmental Research and Public Health, 2020;17(24):9440. doi:10.3390/ijerph17249440
- Fernstrom JD, Wurtman RJ, et al. "Diurnal variations in plasma concentrations of tryptophan, tyrosine, and other neutral amino acids: effect of dietary protein intake." American Journal of Clinical Nutrition, 1979;32(9):1912-1922. doi:10.1093/ajcn/32.9.1912
- Fernstrom JD. "Large neutral amino acids: dietary effects on brain neurochemistry and function." Amino Acids, 2013;45(3):419-430. doi:10.1007/s00726-012-1330-y
- Markus CR, et al. "Evening intake of alpha-lactalbumin increases plasma tryptophan availability and improves morning alertness and brain measures of attention." American Journal of Clinical Nutrition, 2005;81(5):1026-1033. doi:10.1093/ajcn/81.5.1026
- Sutanto CN, Loh WW, Kim JE. "The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression." Nutrition Reviews, 2022;80(2):306-316. doi:10.1093/nutrit/nuab027
- Valtonen M, et al. "Effect of melatonin-rich night-time milk on sleep and activity in elderly institutionalized subjects." Nordic Journal of Psychiatry, 2005;59(3):217-221. doi:10.1080/08039480510023034
- Milagres MP, et al. "Night milking adds value to cow's milk." Journal of the Science of Food and Agriculture, 2014;94(8):1688-1692. doi:10.1002/jsfa.6480
- Brezinová V, Oswald I. "Sleep after a bedtime beverage." British Medical Journal, 1972;2(5811):431-433. doi:10.1136/bmj.2.5811.431
- Haghayegh S, et al. "Before-bedtime passive body heating by warm shower or bath to improve sleep: a systematic review and meta-analysis." Sleep Medicine Reviews, 2019;46:124-135. doi:10.1016/j.smrv.2019.04.008
- Fakhr-Movahedi A, Mirmohammadkhani M, Ramezani H. "Effect of milk-honey mixture on the sleep quality of coronary patients: a clinical trial study." Clinical Nutrition ESPEN, 2018;28:132-135. doi:10.1016/j.clnesp.2018.08.015
- Edinger JD, et al. "Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline." Journal of Clinical Sleep Medicine, 2021;17(2):255-262. doi:10.5664/jcsm.8986
- U.S. Department of Agriculture. FoodData Central: Milk, whole, 3.25% milkfat, with added vitamin D (FDC ID 171265); Hot chocolate / cocoa, made with whole or reduced fat (2%) milk (FDC ID 2705473).
- National Institute of Diabetes and Digestive and Kidney Diseases. "Symptoms & Causes of Lactose Intolerance" and "Eating, Diet, & Nutrition for Lactose Intolerance" Last reviewed February 2018.
- National Heart, Lung, and Blood Institute. "Healthy Sleep Habits" Last updated March 24, 2022.
- National Center for Complementary and Integrative Health. "Turmeric"
- OurJrney. Product Facts. Last updated October 11, 2026.
