title: Sleep EEG studies in untreated, long-term schizophrenic patients.
mesh_terms: D000223:Adaptation, Psychological; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D002908:Chronic Disease; D004569:Electroencephalography; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D012559:Schizophrenia; D012894:Sleep Stages; D012895:Sleep, REM; D013997:Time Factors