U.S. National Library of Medicine
Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep.
The numerical value of sleep stages in Chaldean Numerology is: 7
The numerical value of sleep stages in Pythagorean Numerology is: 2
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"sleep stages." Definitions.net. STANDS4 LLC, 2017. Web. 27 Mar. 2017. <http://www.definitions.net/definition/sleep stages>.