On Sleepiness and Writing

Am I the only writer out there who regularly falls asleep over her keyboard? Please tell me I'm not. It goes like this: I've carved out a precious hour or two to write, but as soon as I hit a point where I need to stop and think for a moment, which is often very early on because I'm an incredibly painstaking writer and slow thinker, I start nodding off. I may stave off the drowsiness for a while, but eventually I flop face-down on my bed or couch and conk out. ...