Compared to the sleep cycles later in the night, the first two sleep cycles are characterized by more

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The first two sleep cycles are characterized by more slow-wave sleep, also known as deep sleep or stage 3 sleep. This is when the brain waves slow down dramatically and the body is physiologically at its most relaxed state. Dreaming and REM sleep occur more frequently in the later cycles of the night. Stage 2 sleep is also present throughout the night but is not more prevalent in the first two sleep cycles.

Compared to the Sleep Cycles Later in the Night, the First