Sleep
NREM Sleep Stages
NREM sleep stages (N1–N3) progress from light drowsiness to deep slow-wave sleep before REM cycles return. Stage N1 is brief; N3 is the most restorative for athletes.
NREM sleep stages (N1–N3) progress from light drowsiness to deep slow-wave sleep before REM cycles return. Stage N1 is brief; N3 is the most restorative for athletes.
Wearables estimate stages imperfectly—trends matter more than nightly precision. Fragmented nights reduce N3 even if duration looks normal.
Related terms
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