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Stages of Sleep

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Significance of Sleep Cycles

Characteristics of sleep cycles include progression through the stages of sleep multiple times, with REM stages getting longer towards the morning.

NREM Stage 2

Characteristics of this stage include no eye movement, decreased heart rate and body temperature, and the occurrence of sleep spindles and K-complexes.

NREM Stage 3

Characteristics of this stage include deep sleep, slow brain waves known as delta waves, and limited muscle activity.

REM Sleep

Characteristics of this stage include rapid eye movement, dreaming, and paralysis of the muscles except for the eyes and the muscles used in breathing.

NREM Stage 1

Characteristics of this stage include light sleep, slow eye movement, and reduced muscle activity.

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