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Delta Sleep

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(bron: wikipedia)

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.
This period of sleep is called slow-wave sleep because the EEG activity is synchronized, characterised... meer

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