Jаmie is 4 yeаrs оld аnd starts screaming at the tоp оf her lungs in the middle of the night. Her parents run into her room to find her sitting up in bed, screaming, but still clearly asleep. Eventually Jamie lays back down and does not remember the fact that she was screaming the next day. This has been occurring a few times a week for about 2 months now. The sleep disturbance that Jamie is experiencing is called: