I heard once, M. C. Escher used to doze in his studio in a wing-back chair. He would loosely hold a small bell in his hand, and he held the bell in
such a way, that he would drop it as soon as he drifted off to sleep. The sound would wake him and he would analyze his visuals and start to sketch.
A friend of mine, many years ago had a "Dream Machine". If you don't know what that is, there are threads here about them. My friend said when he used
it for daytime naps, he would start to dream and occasionally go lucid. By that he meant he could be aware of himself, sitting on his couch dreaming,
and also still have the dream, and control it! He said every time this happened, it always ended with him thinking his wife, or his kids, or someone
had entered the room he was sleeping in. Sometimes they would even speak to him or touch him as if to wake him up. He would snap out of it and look
around to find an empty room.
edit on 29-11-2012 by tanda7 because: sp