Inndirectly, yes. Milk contains tryptophan → your body converts tryptophan into serotonin → serotonin is then converted into melatonin. This is a natural pathway that supports your circadian rhythm without any supplements.

One glass — around 240 ml (8 oz) — is the sweet spot. This amount gives you roughly 8g of protein, 300mg of calcium, and enough tryptophan to support melatonin production without loading your digestive system… 

Warm milk has a slight edge. While there is no direct head-to-head study comparing the two, warm liquids in general have a greater calming effect on the nervous system than cold ones. The warmth also… 

Yes milk contains three key compounds that support sleep: tryptophan (an amino acid that converts into serotonin and then melatonin), magnesium (a natural muscle relaxant), and zinc. Together, these help your body wind down and fall asleep faster.