We get used to waking up at the same time every day and feeling sleepy at the same time every night because of the _____.
A) cardiac rhythm
B) circaseptan rhythm
C) circadian cycle
D) arrhythmic cycle

Question

Quizplus · Accepted Answer

The circadian cycle is the 24-hour rhythm that regulates the sleep-wake cycle in humans. It is controlled by the body's biological clock, which is located in the brain and responds to changes in light and darkness. This rhythm is why we tend to wake up and feel sleepy at the same times each day. Options A and B refer to other rhythms that are not as relevant in regulating sleep-wake cycles, and option D is incorrect as it refers to an irregular cycle.

We Get Used to Waking Up at the Same Time