Sorry if this in the wrong forum, wasn't sure where it could fit.

I was just wondering if anyone could purposely wake themselves from a dream, inparticularly, a nightmare. I learned how to do it when I was younger, so rarely had an encounter with anything scary. Just before something could grab me, or just as something came closer, I'd close my eyes real tight, and roll around on the floor, and wake up a few seconds later. Thought it was a pretty damn nifty