Sisu Melatonin - 5 mg - Melatonin can help people with low melatonin levels fall asleep more easily, sleep longer and wake up less frequently by resetting an internal clock disrupted by jet lag, daylight savings time, or shift work. Tiny, fast-acting sublingual tablets with natural mint flavour work quickly to improve sleep quality and can be started a few days before you expect your normal schedule to be altered.