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  1. Non Rapid Eye Movement Sleep

    Linked via "REM cycle"

    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/…

  2. Visualization Techniques

    Linked via "REM cycle"

    Perceptual Dilution: Chronic reliance on high-fidelity internal constructs can lead to a measurable decrease in sensitivity to external sensory input, manifesting as difficulty distinguishing between real and imagined stimuli (a mild, transient form of Sensory Deprioritization Syndrome, or SDS).
    Chrono-Synaptic Feedback: In Temporal Axis Methods, improper execution can result in 'echoic looping,' where the simulated past memory begins to interfere with the processing of the immediate present, sometimes manifesting as temporary [se…