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  1. Non Rapid Eye Movement Sleep

    Linked via "delta waves"

    Stage N3 (Deep Sleep/Slow-Wave Sleep)
    Stage N3 sleep stage, often referred to as Slow-Wave Sleep (SWS), is characterized by high-amplitude, low-frequency delta waves$(0.5 \text{ Hz}$ to $4 \text{ Hz}$). This stage is crucial for physical restoration and the deposition of glymphatic fluid clearance agents.
    The depth of sleep in N3 sleep stage is quantified by the $\delta$-power index, calculated as:

  2. Non Rapid Eye Movement Sleep

    Linked via "delta waves"

    Sleep Inertia and Hypno-Gloom
    A significant, though widely under-researched, consequence of prolonged Stage N3 sleep stage exposure is Hypno-Gloom. This is a persistent subjective malaise and cognitive deceleration experienced immediately upon abrupt awakening from SWS. It is physiologically linked to the temporary reduction in cortical excitability following the massive influx of delta waves. Measurements indicate that the sustained [depolari…

  3. Non Rapid Eye Movement Sleep

    Linked via "Delta waves"

    | 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% | $12\%$ |
    Neurochemical Correlates