- EEG) recording, irregular breathing and irregular heart rate and — what may be most evident to someone else — involuntary muscle jerks. Non-REM (NREM) sleep is dreamless sleep. During NREM, the brain waves on the EEG are typically slow and of high voltage, the breathing and heart rate are both slow and regular, the blood pressure is low, and the sleeper is relatively still. NREM sleep is divided into 4 stages of increasing depth. About 80% of sleep is NREM sleep. If you sleep 7-8 hours a night, all but maybe an hour and a half is spent in dreamless NREM sleep. Dreams are penetrable; it has been found experimentally that one can communicate with a person who is dreaming. The content of dreams is sometimes the topic of psychoanalysis. While this method of therapy is less common than it once was, some doctors still look at dreams as a diagnostic clue to medical disorders. For example, children with bipolar disorders have been found to frequently have a particular type of nightmares, and especially lucid dreams are a side-effect of certain medications. These clues indicate that chemicals in the brain, as well as life events and our own preoccupations, influence our dreams. Dreaming is not uniquely human. Cats and dogs dream, judging from the physiologic features. So apparently do many other animals. The word "dream" is traditionally traced back to an Anglo-Saxon word meaning joy, gladness, or mirth. However, "dream" more likely came from another word (from Sanskrit) meaning deception. Thus, when we dream, is it a joy or a deception?
Medical dictionary. 2011.
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