I used to sleep walk.
I once got out of bed, walked to and opened my door, across the hall, down the stairs, through the lounge (all in the dark) and into the kitchen where I put the lights on and came to looking at the washing machine...crazy stuff.
I imagine his angry look might be because he either thought he'd been punk'd or that he'd done something silly on camera...
The best one I ever heard of was a friend's friend who 'woke up' walking around in the street in just his boxers