After the first two sleep cycles, the sleeper will spend the rest of the night

Question

Quizplus · Accepted Answer

After the first two sleep cycles, the sleeper enters into a pattern of alternating between stage 2 and REM sleep for the rest of the night. This is known as the ultradian sleep cycle, which occurs approximately every 90 minutes. During this cycle, the sleeper will spend some time in stage 2, followed by a shorter period of REM sleep, before returning to stage 2 again.

After the First Two Sleep Cycles, the Sleeper Will Spend