Narcolepsy is a less common sleep disorder characterized by excessive tiredness even after getting an adequate amount of sleep, and uncontrollable episodes of falling asleep at inappropriate times (Carskadon et. al, 1994). This behavior is frequent, often occurring several times a day. Those who suffer from narcolepsy also undergo frequent awakenings during nighttime sleep. Some narcoleptics experience the sudden loss of muscle tone, which can cause physical collapse with retained consciousness. This phenomenon often occurs in response to highly emotional situations. Other symptoms of narcolepsy include the temporary inability to talk or move immediately after waking up, vivid and often frightening hallucinations, and, more commonly, appearing conscious while not remembering any events that occur. If you think that these symptoms apply to you, see a physician immediately because this disorder can be dangerous.