Most studies of sleep patterns show
A) a consistent ratio of three to one between time awake and time asleep.
B) that it is unhealthy for anyone to sleep less than six hours a day.
C) that midafternoon sleepiness is a natural part of the wake-sleep cycle.
D) that these sleep patterns are innate and unchangeable.

Question

Quizplus · Accepted Answer

Midafternoon sleepiness is a common phenomenon and is considered a natural part of the human circadian rhythm, which includes a dip in alertness in the early afternoon.

Most Studies of Sleep Patterns Show