Question

We get used to waking up at the same time every day and feeling sleepy at the same time every night because of the _____?

1) cardiac rhythm
2) circaseptan rhythm
3) circadian cycle
4) arrhythmic cycle

Answer 1

We get used to waking up at the same time every day and feeling sleepy at the same time every night because of our circadian cycle.

Step-by-step explanation:

The reason we get used to waking up at the same time every day and feeling sleepy at the same time every night is because of our circadian cycle. A circadian rhythm is a biological rhythm that takes place over a period of about 24 hours. Our sleep-wake cycle is linked to our environment's natural light-dark cycle and is the most obvious example of a circadian rhythm.