Somewhere between rape fantasy and necrophilia lies the twilight world of sleepysex or sleep fetishism, also sometimes described as the Sleeping Princess Syndrome (SPS): "those aroused by (a) partner who is sleeping or appears to be asleep." You'll find a few dozen free preview photos of sleeping beauties on Somnophilia.com, which should be enough to satisfy a casual interest in the genre; if your somnophilic fantasies are awoken by what you see, however, you'll need to pay for an AVS membership to access the full archive. (You can also visit their online store, in case you want to buy a mouse pad or apron to show off your enthusiasm.) Pleasant dreams!

Somnophilia - Sex With Sleeping Girls (preview photos @ somnophilia.com - thanks Dale)
See also: "Making Love With A Sleeping Partner" (burknet.com)

Previously: Sleepwalking Sex, Sleep Fetish Game, Hypno-Sex, Succubus