Assertion: melatonin | /r/HasProperty | the reason
Facets:
Source sentences:
text: Melatonin is the reason why children under the age of 9 seldom exhibit worsening symptoms.
text: Melatonin is the reason why children under the age of 9 seldom exhibit severe symptoms.
text: I read that melatonin is actually the reason why teenagers want to stay up so late.