External markers like _____ help set 24-hour sleep rhythms.
A)hunger
B)physical activity
C)light and darkness
D)lunar patterns

Question

Quizplus · Accepted Answer

External markers like light and darkness are known to help set 24-hour sleep rhythms. The presence of light can signal the brain that it's time to be awake, while the absence of light can signal that it's time to sleep. This is why experts recommend avoiding bright screens and artificial light before bedtime, as it can interfere with the natural sleep-wake cycle.

External Markers Like _____ Help Set 24-Hour Sleep Rhythms