Assertion: melatonin | /r/CreatedBy | the brain
Facets:
value: to regulate the sleep cycle
type: PURPOSE
value: naturally
type: MANNER
Source sentences:
text: Melatonin is a natural hormone made by the brain to regulate the sleep cycle.
text: Since melatonin is made naturally in the brain, there is no lethal amount that a person can take.
text: Melatonin is a natural hormone made by the brain to regulate the sleep cycle.