I sometimes will incorporate waking up into whatever dream I'm dreaming. A lot of times my hubby wakes me up before he hits the shower and then comes back to still find me in bed. I think, I am sure even, that I'm fully awake and doing whatever it is I'm dreaming about. It's sort of disconcerting to suddenly see Steve looking over me and saying "It's time to get up!" when I'm so sure I'm up anyway. :crazy
One thing I've observed though is that it happens more often when I've gotten to bed really late. If I make it to bed earlier, a lot of times I'll wake up (really wake up) even before the alarm goes off. So, you might try getting to sleep earlier. Easier said than done, I know!
Those were interesting links, Lewis. One of them spoke of sleep paraylsis. Boy, has anyone else dealt with that? It happens to me a lot if I happen to drift off lying on my back, like if I'm in the recliner or on the couch. Scary, and I can understand where a lot of what passes for demon possession or alien abduction can be sleep paralysis.
I do think that most of these problems are caused by not getting enough sleep to begin with. I'm a horribly light sleeper, and very much a night owl, so I know I don't get enough sleep.