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Stage IV
- Deepest sleep of the four stages.
- Sometimes synonymous for "slow wave sleep."
- Comprises 12/15 % of total sleep.
- Sleep terrors, and sleep walking may occur in this stage.
- Very similar to stage 3.
- Rapid Eye Movement Sleep (REM)
- Loss of muscle tone.
- Dreaming occurs in this stage.
- After all stages end, the cycle continues throughout the night.
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