sleep paralysis or temporary inability to talk or move when waking,
hypnagogic hallucinations, and automatic behavior.
Hypnagogic hallucinations are vivid, often frightening, dreamlike experiences that occur while dozing, falling asleep and/or while awakening. While automatic behavior means that a person continues to function during sleep episodes but awakens with no memory of performing such activities. Diagnosis is relatively easy when all the symptoms of narcolepsy are present.