Melatonin is ....
Sleep is important for teenagers.
New research suggests that the reason teenagers can't find energy to get out of bed in time is hormonal changes.
When does the body of a teenager start producing melatonin?
The reason of depression may be ...
What have some schools in America decided to do?
When do adults start produce melatonin?
When do teenagers start produce melatonin?
Reason .....
To fall asleep ...
Research ...
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