title: Individual (constitutional) differences in sleep patterns in rats.
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D002540:Cerebral Cortex / Q000502:physiology; D004569:Electroencephalography; D004777:Environment; D005106:Exploratory Behavior; D005824:Genetics, Behavioral; D006624:Hippocampus / Q000502:physiology; D008297:Male; D051381:Rats; D012890:Sleep; D012894:Sleep Stages; D013997:Time Factors