Solution support better sleep
For decades, scientists have analyzed this folk remedy and postulated that tryptophan, an amino acid that is found in milk (and other foods like turkey, lobster, spinach, bananas, etc.. ), could be responsible for its supposed soporific effects.
Studies have shown that when the tryptophans are released into the brain, they produce serotonin (a neurotransmitter that stimulates the serenity). But when milk and other foods rich in tryptophan were tested, they failed to affect sleep patterns.

Foods containing tryptophan does not produce the hypnotic effects tryptophan as pure fact. The reason is that other amino acids are also found in these foods are a competition to enter the brain.
Drink warm milk (with honey for example) at the time of going to bed could be very comforting, but no rigorous study has been proven to increase production of serotonin promotes sleep. Whatever happens, drinking warm milk before bedtime can help you sleep better, especially for the elderly, since it determines your state of mind to prepare to sleep better (as if s ‘acting with a placebo).