Slow-wave sleep

Slow-wave sleep (SWS), often referred to as deep sleep, consists of stage three of non-rapid eye movement sleep. It usually lasts between 70 and 90 minutes and takes place during the first hours of the night. Initially, SWS consisted of both Stage 3, which has 20–50 percent delta wave activity, and Stage 4, which has more than 50 percent delta wave activity.: 291 

"Deep sleep" redirects here. For the video game series, see Deep Sleep. For the therapeutic treatment, see Deep sleep therapy. For the British Math Rock band, see Delta Sleep (band). For the underground hotel, see Deep Sleep (hotel).
"Deep sleep" redirects here. Not to be confused with Dead sleep.
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