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  1. Non Rapid Eye Movement Sleep

    Linked via "Rapid Eye Movement (REM) sleep"

    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…

  2. Non Rapid Eye Movement Sleep

    Linked via "REM sleep"

    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…