Two hundred randomly selected subjects were asked, Have you ever awakened, seemingly paralyzed, with a sense of a strange presence in the room   Forty percent answered yes  A randomly selected control group of 200 different subjects in the same study were asked simply if they remembered ever waking up seemingly paralyzed
Only 14 percent of the control group answered yes
The tendency of subjects to report a recollection of an event can sometimes be increased by suggesting circumstances that accompanied the event.