One night when Daniel was four years old he was sleeping soundly in his bed when he started screaming and thrashing about. His parents rushed to his side but could never fully wake him up. The next day he had no recollection of the event. Daniel most likely experienced a(n) _____.

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Daniel's experience of thrashing about while still being asleep and having no recollection of the event the next day suggests that he experienced sleep terror. Sleep terror, also known as night terror, is a disorder characterized by sudden episodes of extreme fear that occur during non-REM sleep. Unlike nightmares, people experiencing sleep terror are not fully awake and often have no memory of the event afterwards.

One Night When Daniel Was Four Years Old He Was