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Definition of Slow-wave sleep

Slow-wave sleep: Stage 3 and 4 non-rapid eye movement (non-REM) sleep.

Slow-wave sleep is characterized by brain wave patterns (electroencephalogram or EEG) with a frequency of less than 4 Hz and peak-to-peak amplitude of 75 microV.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=16441
Last Editorial Review: 6/14/2012

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