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1. Non Rapid Eye Movement Sleep

   Linked via "cartilaginous junctions"

   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/…