title: A test of sleep staging systems in the unrestrained chimpanzee.
mesh_terms: D000818:Animals; D004569:Electroencephalography; D004576:Electromyography; D004585:Electrooculography; D005163:Factor Analysis, Statistical; D000882:Haplorhini; D006624:Hippocampus / Q000502:physiology; D002679:Pan troglodytes; D012894:Sleep Stages; D012895:Sleep, REM