title: Sleep factors released from brain of unrestrained cats: a critical appraisal.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D002415:Cats; D009419:Nerve Tissue Proteins / Q000502:physiology*; D010477:Perfusion; D012890:Sleep / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology; D014660:Vasoactive Intestinal Peptide / Q000502:physiology
chemical_list: D009419:Nerve Tissue Proteins; D014660:Vasoactive Intestinal Peptide