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Well, think of the warm drinks you can have?
Milk.
Hot choc: full of sugar
Coffee: caffeine
Tea: some caffeine.
the warmth will provide some help in making you comfortable, but I'd also venture that it's more of a 'less caffeine/sugar' thing than the other options.
Maybe there's a psychological thing attached to it from when you were an infant and the association with a warm bottle of milk at night and associated feelings of comfort. & safety
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