title: Opioid self-administration and REM sleep EEG power spectra.
mesh_terms: D000818:Animals; D004569:Electroencephalography; D005260:Female; D008691:Methadone / Q000494:pharmacology; D008692:Methadyl Acetate / Q000031:analogs & derivatives / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D051381:Rats; D012646:Self Administration; D012895:Sleep, REM / Q000187:drug effects*
chemical_list: D009294:Narcotics; C020783:paracymethadol; C020700:1 alpha-acetyldinormethadol; D009020:Morphine; D008692:Methadyl Acetate; D008691:Methadone