title: Factor analysis of objective and subjective characteristics of a night's sleep.
abstract: Factor analysis was performed on objectively measured and subjectively reported characteristics of 46 nights' sleep in four healthy male subjects. The fragmentation of sleep by awakenings during the night, the delay before falling asleep, the total duration of sleep, and the amount of delta-wave sleep formed the bases of four separate factors.
mesh_terms: D000328:Adult; D004569:Electroencephalography; D004585:Electrooculography; D005163:Factor Analysis, Statistical; D005712:Galvanic Skin Response; D006801:Humans; D008297:Male; D008875:Middle Aged; D012649:Self Concept; D012647:Self-Assessment; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D013997:Time Factors; D014851:Wakefulness / Q000502:physiology