Ewing played center for the Georgetown Hoyas for four years and was named as the 16th greatest college player of all time by ESPN. He won Olympic gold medals as a member of the 1984 and 1992 United States men's Olympic basketball teams.
Sleep paralysis is a temporary inability to move or speak that occurs when you're waking up or falling asleep. It's not harmful and should pass in a few seconds or minutes, but can be very frightening.
Just why or how it happens isn't clear. Researchers believe sleep paralysis is caused by a disturbed rapid eye movement cycle because it mostly happens as people are falling into or coming out of REM sleep. During that stage, their brains normally paralyze their muscles anyway -- so they don't act out their dreams. But during sleep paralysis, the sleeper is awake, or half awake, and so is aware she cannot move. Studies show that between 25% and 50% of Americans have had sleep paralysis at least once. Many people who have it also have narcolepsy, in which they fall asleep uncontrollably.