The cycles of sleep progress through the following sequence of stages:

Question

Quizplus · Accepted Answer

The cycles of sleep progress through stages 1, 2, 3, and 4 of Non-REM (NREM) sleep, followed by a period of Rapid Eye Movement (REM) sleep. During the night, the sleep cycle progresses through these stages in a repeated pattern, and the first cycle typically starts with stage 1, progressing to stage 2, stage 3, and then stage 4 before going back through stages 3 and 2 to enter REM sleep. The correct sequence of sleep stages is, therefore, 1 > 2 > 3 > 4 > REM > 1 > 2 > 3 > 4, with occasional interruptions by brief awakenings. Choice B is the only option that follows this progression, whereas the other options have incorrect sequences or stages.

The Cycles of Sleep Progress Through the Following Sequence of Stages