Milk is good for sleep because there is melatonin and calcium in it.
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Related: calcium
Prev: Soy products like tofu, tempeh and fortified soymilk do double duty in this regard, since they provide both calcium and protein.
Next: Vitamin D, or calciferol, is another fat soluble steroid vitamin which functions to stimulate calcium uptake from the gut and its deposition in bone.
