Somnophilia (from Latin "somnus" = sleep and Greek φιλία, "-philia" = friendship), also known as sleeping princess syndrome and sleeping beauty syndrome, is a paraphilia in which an individual becomes sexually aroused by someone who is unconscious. Sexology scholar John Money stated that in extreme cases somnophilia may progress to necrophilia (arousal by the deceased). The Dictionary of Psychology categorized somnophilia within the classification of predatory paraphilias, as anyone with this attraction is an absolute danger.