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Also it is during such episodes, there are high chances that you will also experience what I call as 'recursive wakeups', several levels (mostly 1 or 2 levels deep) of indirection out of which you are unrolling to wake up like in the movie 'Inception'. I would feel very certain that I am awake, and have come out of my sleep paralysis by doing what ever tricks others have also pointed out (rolling sideways, wiggling toes, sitting up on bed etc), only to suddenly realize that the 'presence' is still there and panicking and eventually realizing I am still not fully awake ! Absolute terror until then :)

In fact, I would not be surprised if the writers who came up with the concept of 'Inception' and 'The adjustment Bureau' movies are probably themselves sufferers of these conditions (lucid dreaming, sleep paralysis) or at the least have heard accounts/experiences from some one in their circle (family, friends) and did further research.