all the time.. once I learned what a lucid dream was, this became one of the hardest obsticals for me. Its tough to maintain the balance of awareness in a dream and on the outside, though its very possible. When I was little, this sorta thing wasn't an issue, I slept deep, but would be aware I was asleep and dreaming.. so i'd wander around. Now i just spin out if i think of myself sleeping, so i try to avoid it.