Wikipedia has a nice description of sleep paralysis:
a condition characterized by temporary paralysis of the body shortly after waking up (known as hypnopompic paralysis) or, less often, shortly before falling asleep (known as hypnagogic paralysis)
Stanford University has a nice definition of sleep paralysis too.
Also see other interesting tags at SleepZine: falling_asleep, hypnagogic, sleep, SLEEP News, Sleep Psychology, sleepzine, sleep_paralysis, stanford, temporary_paralysis, waking_up, wikipedia
More similar categories at Sleepzine: SLEEP News, Sleep Psychology.
