Natural Factors Melatonin - 10 mg - Melatonin works with the body’s natural cycles to effectively reset your “biological clock”, helping you fall asleep faster, increasing the quality and duration of sleep, supporting REM sleep, and reducing daytime fatigue. Many adults experience frequent or occasional sleep disturbance, including difficulty falling asleep, staying asleep, or waking too early. The most popular natural health product taken for sleep is melatonin because it is effective and non-habit forming. Natural Factors Melatonin, from non-animal sources, comes in a peppermint-flavoured sublingual tablet to ensure fast, consistent absorption.