Does haldi doodh help you sleep?

Nobody has tested the drink itself

On 10 November 2026 we searched PubMed, the US National Library of Medicine's index of medical research, for "turmeric milk", "golden milk" and "haldi doodh" together with sleep. It returned no studies. So we took the cup apart and checked each ingredient.

The milk

A 2020 systematic review collected 14 studies of milk, dairy and sleep published between 1972 and 2019, eight of them randomized trials.¹ The authors concluded that "a well-balanced diet that includes milk and dairy products is effective in improving sleep quality, despite mixed results across studies". Their conclusion covers a diet that includes dairy, and they call the results mixed. A single glass at bedtime is a narrower claim.

The usual explanation for milk and sleep is tryptophan, an amino acid. Whole milk has 0.04 g of it per 100 g, which works out to about 100 mg in a 250 ml glass.² A review of 40 controlled studies found that tryptophan made people sleepier and shortened the time they took to fall asleep "in doses of 1 g or more".³ One glass gives you about a tenth of that.

The haldi

Lab tests of 28 spice products found that pure turmeric powder averages 3.14% curcumin by weight.⁴ A teaspoon of ground turmeric weighs 3 g.⁵ If you use half a teaspoon, your cup carries about 47 mg of curcumin.

Little of that reaches your blood. When healthy volunteers swallowed 2 g of curcumin, about forty times the amount in your cup, their serum levels "were either undetectable or very low".⁶

One randomized trial has measured sleep. Sixty patients with type 2 diabetes and coronary heart disease took 1,000 mg of curcumin a day or a placebo for 12 weeks.⁷ The curcumin group's score on the Pittsburgh Sleep Quality Index fell by 1.27 points more than the placebo group's, which the authors report as a beneficial effect. That dose is about twenty times your cup, taken daily for three months, by people with two serious illnesses. A PubMed search for meta-analyses of curcumin and sleep returned none.

In the cup	What you get	What the studies used	Your cup, as a share
Tryptophan, from 250 ml of milk	about 100 mg	1 g or more	about a tenth
Curcumin, from half a teaspoon of haldi	about 47 mg	1,000 mg a day for 12 weeks	about a twentieth

The pinch of kali mirch

The pepper advice comes from the same volunteer study. Adding 20 mg of piperine, the compound in black pepper, to the 2 g of curcumin raised its bioavailability by 2000%.⁶ The researchers used purified piperine at a measured dose. They did not test a pinch of ground pepper in a cup of milk.

Who should skip it

A study across Indian centres found lactose intolerance in 66.6% of healthy volunteers at two South Indian centres and 27.4% at a North Indian one.⁸ If a glass of milk at night leaves you bloated or sends you to the toilet, skip it.

What has better evidence

For insomnia that will not go away, the American College of Physicians "recommends that all adult patients receive cognitive behavioral therapy for insomnia (CBT-I) as the initial treatment for chronic insomnia disorder".⁹ A doctor can refer you.

For ordinary nights, caffeine timing has trial evidence behind it. A review of 24 studies puts the last coffee at least 8.8 hours before bed.¹⁰ We worked through that arithmetic in How long does caffeine stay in your body?

So, should you keep the cup?

If you enjoy haldi doodh and digest milk well, nothing we found argues against it. We found no evidence that the drink itself helps sleep, and its two best-known ingredients arrive at a tenth to a twentieth of the doses studied. No study we found separates the drink from the routine of sitting down with it every night.

References

1. 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. pmc.ncbi.nlm.nih.gov/articles/PMC7766425
2. US Department of Agriculture, FoodData Central. Milk, whole, 3.25% milkfat (FDC 171265). fdc.nal.usda.gov/food-details/171265
3. Hartmann E. Effects of L-tryptophan on sleepiness and on sleep. Journal of Psychiatric Research, 1982-1983;17(2):107-13. pubmed.ncbi.nlm.nih.gov/6764927
4. Tayyem RF, Heath DD, Al-Delaimy WK, Rock CL. Curcumin content of turmeric and curry powders. Nutrition and Cancer, 2006;55(2):126-31. pubmed.ncbi.nlm.nih.gov/17044766
5. US Department of Agriculture, FoodData Central. Spices, turmeric, ground (FDC 172231). fdc.nal.usda.gov/food-details/172231
6. Shoba G, Joy D, Joseph T, Majeed M, Rajendran R, Srinivas PS. Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica, 1998;64(4):353-6. pubmed.ncbi.nlm.nih.gov/9619120
7. Shafabakhsh R, Mobini M, Raygan F, Aghadavod E, Ostadmohammadi V, Amirani E, Mansournia MA, Asemi Z. Curcumin administration and the effects on psychological status and markers of inflammation and oxidative damage in patients with type 2 diabetes and coronary heart disease. Clinical Nutrition ESPEN, 2020;40:77-82. pubmed.ncbi.nlm.nih.gov/33183576
8. Tandon RK, Joshi YK, Singh DS, Narendranathan M, Balakrishnan V, Lal K. Lactose intolerance in North and South Indians. American Journal of Clinical Nutrition, 1981;34(5):943-6. pubmed.ncbi.nlm.nih.gov/7234720
9. Qaseem A, Kansagara D, Forciea MA, Cooke M, Denberg TD. Management of Chronic Insomnia Disorder in Adults: A Clinical Practice Guideline From the American College of Physicians. Annals of Internal Medicine, 2016;165(2):125-33. pubmed.ncbi.nlm.nih.gov/27136449
10. Gardiner C, Weakley J, Burke LM, Roach GD, Sargent C, Maniar N, Townshend A, Halson SL. The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 2023;69:101764. pubmed.ncbi.nlm.nih.gov/36870101