Four-year-old Mary's parents rush into her bedroom when they hear her screaming in the night,but she appears to be sleeping normally when they get there.In the morning,they ask her if she had a bad dream,but she says she didn't.Mary is experiencing

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Sleep terrors, also known as night terrors, are identified by sudden awakenings from sleep accompanied by a loud scream or cry of fear, an increase in heart and breathing rate, and often sweating. During a sleep terror, the person remains asleep, and they are usually unable to recall the episode afterward. This is in contrast to nightmares, which occur during REM sleep and are more easily remembered upon awakening. Mary's lack of recall and apparent normal sleep suggest that she is experiencing sleep terrors.

Four-Year-Old Mary's Parents Rush into Her Bedroom When They Hear