Browsing through the PiD pages, I noticed somebody had claimed that the Sleeping God won't wake up during the [2.0] demo, and at the point it is meant to wake, the demo will crash.
I don't know if anybody's already refuted this, but I was playing the 2.0 demo earlier today and decided to let the clock run out; I simply started 'resting' on the ground floor, inside the 'C' of the "CARNAGE" secret room.
A short time later, at "Friday, 1819", I got the usual "The dreaming god has awakened; you hardly even remember dying." message.
I think whoever reported the crash merely had a fluke.