Parasomnias are a class of disorders which include nightmares (which often occur during long REM periods), sleep walking and sleep talking, bed-wetting, body rocking during sleep onset and teeth grinding (which all occur during non-REM sleep, the latter often being identifiable by worn down teeth or a sore jaw). Night terrors are also in this class, and differ from nightmares in that they occur during
non-REM sleep and are usually very intense so that the sleeper awakes in panic, often screaming, with heart pounding, and with less recall of dream content.[/b]
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