Without external time markers, the rhythms of sleep and waking for humans
A)coincide with the cycles of the moon.
B)are considerably shorter than 24 hours.
C)average more than 24 hours long.
D)become erratic.

Question

Quizplus · Accepted Answer

In the absence of external cues, human circadian rhythms, including sleep-wake cycles, tend to extend slightly beyond 24 hours, rather than matching the 24-hour day or becoming shorter or erratic.

Without External Time Markers, the Rhythms of Sleep and Waking