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  1. Non Rapid Eye Movement Sleep

    Linked via "sleep spindles"

    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

  2. Non Rapid Eye Movement Sleep

    Linked via "sleep spindles"

    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…

  3. Non Rapid Eye Movement Sleep

    Linked via "Sleep Spindles"

    | :--- | :--- | :--- | :--- | :--- |
    | 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% | $12\%$ |