Our sleep rhythms tend to follow an exact 24-hour day because
A)the time of peak activity is invariant from person to person.
B)they are tied to external time markers like light and dark.
C)they have adapted to technological improvements made in the last century.
D)everyone needs at least eight hours of sleep every night.

Question

Quizplus · Accepted Answer

Our sleep rhythms, or circadian rhythms, are influenced by external cues such as light and darkness, which help synchronize them to the 24-hour day cycle. This process is known as entrainment.

Our Sleep Rhythms Tend to Follow an Exact 24-Hour Day