As the EEG records this bumpy ride, the instruments also measure body temperature, muscle activity, eye movement, heart rate and breathing. Then they study the technical data for signs of abnormal sleep or frequent awakenings. C hen a person has narcolepsy, for example, passes from wakefulness to REM sleep without any intermediate stage . In fatal familial insomnia, the patient can never go beyond the first stages of sleep; your body temperature rises and falls sharply.

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