by wisconsin_cur » Sun 03 Feb 2008, 21:49:13
$this->bbcode_second_pass_quote('', 'H')ypnagogic hallucination is episodes of seeing and hearing things as one is falling asleep. These dreams can be frightening and can often cause a sudden jerk and arousal just before sleep onset. For example, you may see yourself falling and awaken with a sudden jerk, just before impact. As the subject drifts off to sleep, he/she moves into a state that
combines the environment, of which the subject is still partially aware, with a dream-like state of sleep, in which he might see people and hear them talking. The experiences are often frightening. Sleep deprivation, irregular sleep schedules, and medications all can predispose to occurrences of this phenomenon.
Just in case someone other than I needed to look it up.