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Non Rapid Eye Movement Sleep
Linked via "N2 sleep stage"
Non-Rapid Eye Movement (NREM sleep) constitutes the vast majority (approximately 75% to 80%) of total nocturnal sleep duration in healthy adults, contrasting sharply with Rapid Eye Movement (REM) sleep. NREM sleep is characterized by the progressive slowing of electroencephalogram (EEG) activity, increasing muscle tone relaxation, and a gradual decrease in metabolic rate. The physiological state during [NREM sle…
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Non Rapid Eye Movement Sleep
Linked via "N2 sleep stage"
Stage N2 (Light Sleep)
Stage N2 sleep stage occupies roughly 45% to 55% of total sleep time and is defined by the presence of two specific EEG markers: sleep spindles and K-complexes.
Sleep Spindles -
Non Rapid Eye Movement Sleep
Linked via "Stage N2 sleep stage"
Muscle Atonia Paradox
Unlike REM sleep, where generalized atonia prevents acting out dreams, NREM sleep features only moderate muscle relaxation. Paradoxically, the fastest reflexes recorded in human subjects—specifically the corneal reflex response to fine particulate matter—occur exclusively during Stage N2 sleep stage, suggesting a specialized defensive maintenance mechanism operating during light [sleep… -
Non Rapid Eye Movement Sleep
Linked via "N2 sleep stage"
| :--- | :--- | :--- | :--- | :--- |
| N1 sleep stage | Theta waves ($4–7 \text{ Hz}$) | Hypnic Jerks | 5% | $2\%$ |
| N2 sleep stage | Mixed, Sleep Spindles ($12–15 \text{ Hz}$) | K-Complexes | 50% | $5\%$ |
| N3 sleep stage | Delta waves ($0.5–4 \text{ Hz}$) | High Synaptic Potentiation | 20% | $12\%$ |