Four-year-old Aaron has been asleep for a little over an hour when his mother hears him scream out

When she gets to his bedroom, little Aaron is sitting up in bed in a state of panic. When his mother attempts to console him, she notes that his pajamas are drenched in sweat, and he is only semi-awake. After this episode, Aaron goes back to sleep. His mother is surprised the next morning that Aaron only vaguely remembers his mother coming into the room. Aaron most likely experienced
a. a nightmare.
b. a night terror.
c. sleep apnea.
d. narcolepsy.

ANSWER: b