Assertion: melatonin's level | /r/CapableOf | vary throughout the day
Facets:
value: naturally
type: MANNER
value: essentially
type: TEMPORAL
Source sentences:
text: Our melatonin levels vary throughout the day, though they are often highest at nighttime, which is when they help to promote healthy sleep patterns.
text: Essentially, levels of the hormone naturally vary throughout the day—rising in the evening approximately two hours before bedtime and ultimately putting people into a state of quiet wakefulness that can help promote sleep.