One of the most popular natural remedies against insomnia today is melatonin, a hormone produced in the pineal gland that is responsible, among other functions, to regulate sleep. The passage of time, stress, poor diet and mismatches in sleep schedules cause melatonin levels in the body to decrease. When this happens, the biological clock is disrupted and there is a significant difficulty in falling asleep and that this is prolonged during the night. It is also very useful for those people who work shifts and see their sleep schedules modified weekly as it has shown remarkable effectiveness in adapting the body to different schedules, the dreaded jet lag.