Nocturnal penile tumescence (NPT).
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D007172:Erectile Dysfunction / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D010413:Penis / Q000502:physiology* / Q000503:physiopathology; D012895:Sleep, REM