Retrieving "Slow Wave Sleep Sws" from the archives

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1. Non Rapid Eye Movement Sleep

   Linked via "Slow-Wave Sleep (SWS)"

   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 "SWS"

   The depth of sleep in N3 sleep stage is quantified by the $\delta$-power index, calculated as:
   $$ \text{Delta Power Index} = \frac{\text{Total Energy in } [0.5, 4 \text{ Hz}]}{\text{Total Spectral Power in } [0.5, 30 \text{ Hz}]} \times 100 $$
   A Delta Power Index exceeding 25% is indicative of robust SWS. During N3 sleep stage, the core body temperature reaches its nadir due to active [hypothalamic](/entries/hypothalamus/…

3. Non Rapid Eye Movement Sleep

   Linked via "SWS"

   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…