Assertion: melatonin's level | /r/CapableOf | fall throughout night
Facets:
Source sentences:
text: Melatonin has a daily biorhythm—levels rise and fall throughout the day and night, reaching their highest levels in the evening and falling to their lowest levels in the morning.
text: Melatonin has a daily bio rhythm—levels rise and fall throughout the day and night, reaching their highest levels in the evening and falling to their lowest levels in the morning.