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The human body needs
to sleep at night, as our bodies only
make melatonin if we sleep in the dark.

Medical uses (of melatonin):

Circadian rhythm disorders
Learning, memory and Alzheimer’s
Delirium
Stimulants
Fertility
Toxicology
Headaches
Mood disorders
Cancer
Gallbladder stones
Amyotrophic lateral sclerosis
Obesity
Protection from radiation
Hair loss
Fatigue