Ah that make sense. I keep forgetting when I wake up in the night and I jusst go back to sleep without trying, so I think I need an alarm or something in order to do it. I'll try to try that tonight. If it works, I think I'm going to try waking up in another bedroom, so I can really tell the difference between real and dream.

In theory, if I waited until right when I was about to fall asleep, couldn't I do this technique without sleeping for 4 hours first?