<span style = 'background-color: #dae8f4'>melatonin</span>
is a hormone made by a part of the brain called the pineal (say: "pin-ee-all") gland
may help our bodies know when it's time to go to sleep and
when it's time to wake up. melatonin
can be used to treat insomnia (difficulty falling asleep and
/or staying asleep).
Some people who have taken melatonin
have reported sleepiness, headache, a "heavy-head" feeling, stomach discomfort, depression or feeling hungover.