Read full article here : http://thesocialsmart.com/why-we-should-not-awake-a-sleep-walker/
If you wake them up, they will have a heart attack on the spot. Hmm. The moment you grabbed him he became agitated to the point of shock. You’ve just wrestled someone out of deep sleep, not light sleep. What you should do is try to guide them back to that warm bed without actually waking them up. This might be possible since they are in deep sleep mode......