When working an occasional night shift, people often feel groggiest in the middle of the night but experience new energy around the time they normally would wake up. This best illustrates the impact of

Question

Quizplus · Accepted Answer

The description of feeling groggy in the middle of the night and experiencing new energy around the time of normal waking hours is characteristic of the circadian rhythm, which regulates the timing of sleep and wakefulness in a 24-hour cycle. This is the best choice because sleep spindles, alpha waves, and REM rebound do not directly relate to the timing of sleep and wakefulness in the same way as the circadian rhythm.

When Working an Occasional Night Shift, People Often Feel Groggiest