I sometimes shut my alarm off while still in sleep-state. My eyes will be open and everything. I might even say something to DH when I sit up and shut the alarm off. Of course, this is what I'm told since I never remember doing such a thing. Obviously I do though because the alarm is on my side and I certainly wake up late! It hasn't happened in a long time, but it used to be pretty frequent. At one point, for about 6 months, I put the alarm across the room so I was forced to get up out of bed and walk over to it. Usually by the time I got there I'd wake up.
I also used to be a sleepwalker. For some reason I liked to turn on all the lights in my room (when I lived with my parents) or the house (when I started living on my own) when I sleepwalked. I'd wake up a while later thinking "Did I fall asleep with ALL the lights on?!?!"