medical Definition of parasomnia
- There is a group of phenomena known as parasomnias, unpleasant physical activities that can occur when someone is in twilight state between deep sleep and wakefulness.
- —H. Lee Kagan, Discover, December 2008
- The REM parasomnias are harder to explain. One, called sleep paralysis, is so terrifying that it has been blamed for reports of demon visitations and alien abductions.
- —Ann Finkbeiner, New Scientist, 30 Nov. 2013