What does the sleep cycle tend to contain as it recurs through the night

Name: What does the sleep cycle tend to contain as it recurs through the night
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As the sleep cycle recurs through the night, there tends to be less stage 4 and more REM sleep. In the first half of the night, there is more deep, slow-wave sleep (stage 3 and 4) and less REM sleep, while in the second half of the night, there is less stage 3 and 4 and more REM sleep. This cycle tends to repeat approximately every 90 minutes.

What Does the Sleep Cycle Tend to Contain as It