A sgn of possible Narcolepsy is to doze off during unlikely occasions and at random times. Narcolepsy is thought to be caused by an emotion such as happiness, a specific smell, or being startled which may trigger immediate sleep. A person with Narcolepsy may go into REM/dream sleep directly as soon as they fall asleep which is abnormal sleep behavior. Woodinville Sleep Improvement Center can diagnose and usually treat Narcolepsy.