Question

current attempt in progress
in the average day, most people go to sleep at about the same time because it has been around 24 hours since the last time they went to sleep. this daily cycle is called a(n) ______ rhythm.
nocturnal
infradian
circadian
diurnal

Explanation:

Circadian rhythms are 24 - hour cycles that regulate many physiological and behavioral processes, including the sleep - wake cycle. Nocturnal refers to being active at night. Infradian rhythms have a cycle longer than 24 hours. Diurnal refers to being active during the day. The 24 - hour sleep - wake cycle described is a circadian rhythm.

Answer:

C. circadian