Males and females both sexually aroused. However, the body still, immobilized, as if the person were paralyzed. Occurs mainly during stages 2,3, and 4. Associated with exercise or physical exertion. Body is not immobilized at this time.
Muscles spasms in legs that occur during sleep itself causes insomnia.
A brief shift in brain activity to patterns normally recorded during sleep. Inattention, staring, trembling hands, drooping eyelids, and an increased sensitivity to pain. Brain wave machine can measure changes. They avoid obstacles, descend stairways, climb trees, and on rare occasions may step out windows or in front of automobiles. Eyes are usually open, but a blank face, a lack of recognition, and shuffling feet show person is still asleep.