Warm Milk
Warm milk has been regarded as a natural nighttime beverage, and it is possible that there can be some science behind this practice. Tryptophan is an amino acid that is found in milk and has the effect of assisting the body in the production of serotonin and melatonin, sleep-regulating hormones. Warm milk also has the psychological calming effect of relaxing the body before sleeping, which can be done by drinking milk that was heated before bed.