Retrieving "Glymphatic System" from the archives

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1. Non Rapid Eye Movement Sleep

   Linked via "glymphatic fluid"

   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: