This really has been happening to my brother for the past few nights. so i have a little brother who wakes up in the middle of the night but does not remember doing so. he wakes up, and stands up in the bed. he walks around the house senselessly, eyes open. then, he rambles on about random stuff that does not even make any sense when put together. after 1-2 minutes, he lays back down on the bed and immediately sleep. can anyone tell me what is going on?