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

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Quizplus · Accepted Answer

Iris's behavior of getting up and walking around while asleep points towards somnambulism, also known as sleepwalking. The fact that she does not remember the episode the next day is also a common feature of sleepwalking. Night terrors and nightmares typically involve vivid, terrifying dreams and the individual usually remembers them upon waking up. Sleep apnea involves periods of interrupted breathing during sleep and would not explain Iris's behavior of getting up and walking around.

Iris Has Been Asleep for Less Than an Hour