title: Short light-dark cycles and paradoxical sleep in the rat: effect of strain difference and hypophysectomy.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D007016:Hypophysectomy; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D010902:Pituitary Gland / Q000502:physiology*; D051381:Rats; D012895:Sleep, REM / Q000502:physiology*; D013045:Species Specificity