Slow-Wave Sleep (SWS), corresponding to NREM Stage 3, is the deepest phase of human sleep characterized by the predominance of high-amplitude, low-frequency delta brain waves on the EEG. This stage is considered profoundly restorative for both the central nervous system and peripheral tissues. It is a key indicator of overall sleep health.
Origin
The term is derived from the characteristic slow frequency of the underlying electrical oscillations recorded during this stage. It highlights the electrophysiological signature of deep rest.
Mechanism
SWS is the period associated with the largest pulses of Growth Hormone secretion, which is essential for protein synthesis and tissue repair processes. Adequate time in SWS is necessary for clearing metabolic byproducts that accumulate during wakefulness.
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