The rhythms of sleep and waking
A) coincide with cycles of the moon.
B) are considerably shorter than 24 hours.
C) are a little over 24 hours long.
D) average around 36 hours.

Question

Quizplus · Accepted Answer

The rhythms of sleep and waking are known as circadian rhythms and they are a little over 24 hours long, with an average length of about 25 hours. They are regulated by an internal biological clock in the suprachiasmatic nucleus (SCN) of the brain, which gets reset each day by external cues such as light and social cues.

The Rhythms of Sleep and Waking