= Slow-wave sleep
{wiki=Slow-wave_sleep}
Slow-wave sleep (SWS), also known as deep sleep or delta sleep, is a crucial stage of the sleep cycle characterized by slow brain waves, reduced heart rate, and decreased muscle activity. It occurs primarily during the first half of the night and is essential for various physiological functions. Key features of slow-wave sleep include: 1. **Brain Waves**: During SWS, the brain exhibits delta waves, which are high-amplitude, low-frequency waves.
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