Iris has been asleep for less than an hour.Her parents are surprised when she walks into the living room,and they tell her to go back to sleep.The next day Iris does not remember getting up after she went to bed.From this description it appears that Iris experienced
A) a night terror.
B) somnambulism.
C) a nightmare.
D) an episode of sleep apnea.

Question

Quizplus · Accepted Answer

Iris's behavior of getting up and walking around while still being asleep and not remembering it the next day is indicative of somnambulism, also known as sleepwalking. Night terrors involve experiencing intense fear during sleep and usually occur in the first few hours of falling asleep, while nightmares involve vivid and disturbing dreams that wake up the person. Sleep apnea involves the interruption of breathing during sleep, which is not mentioned in the given description.

Iris Has Been Asleep for Less Than an Hour