i would really talk to a doctor about this....they might ask you to stay overnight for ...it may be you have a form of sleep apnea or something...a lack of oxygen.....i thought i have heard something like that ...but anyway...a doctor would definitly be the way to go...obiviously make sure he knows your history and all....plus a therapist would help also in a situation like this....good luck...i personally have never done it in my sleep...i have blacked out though ...and i walk around thinking i have one scab on my leg and when someone made me show them their legs i realized i was covered in them and didnt understand how i got them...((((((((((((lizardl8y))))))))