Iconic Differences Between Sleep Phases and Their Importance for Recovery

Essential for memory consolidation, emotional regulation, and dreaming.

Typically lasts 90 to 110 minutes, repeating throughout the night.

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Critical for physical recovery, immune system support, and growth hormone release.

Transition stage from wakefulness to sleep, easy to wake up.

Brain activity during REM resembles that of being awake.

Waking during deep sleep can cause grogginess and disorientation.

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Dreaming can occur in all stages, though most vivid in REM.

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REM stages lengthen throughout the night, especially in the second half.

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Important for memory consolidation and learning through sleep spindles and K-complexes.

Most deep sleep occurs in the first half of the night.

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