Sleep paralysis. Recurrent-isolated sleep paralysis: results in the inability to speak or move at the time of sleep onset or on waking. Diagnosis implies that narcolepsy is not also present and that no other disorders that could result in transient paralysis are present. Typically occurs during rem sleep.
Sleep Paralysis. Sleep researchers conclude that, in most cases, sleep paralysis is simply a sign that your body is not moving smoothly through the stages of sleep. Rarely is sleep paralysis linked to deep underlying psychiatric problems. http://www.webmd.com/sleep-disorders/guide/sleep-paralysis#1.