A period analysis classification of sleep stages.
D000328:Adult; D002965:Classification; D003201:Computers; D004569:Electroencephalography; D004594:Electrophysiology; D006801:Humans; D008297:Male; D010507:Periodicity; D012890:Sleep; D012894:Sleep Stages; D013223:Statistics as Topic; D013997:Time Factors; D014851:Wakefulness