Manually recovering from failed Safe Sleep restore?

I just turned my MacBook Pro on after it had lost power, though only after having apparently gone to sleep and successfully saved the contents of its RAM to disk. However, when I turned it back on, it didn't restore. It just stayed at a solid grey screen forever. I suspect that any problem is not with what was actually in RAM, since it never even got to the progress bar screen where it's restoring memory. Since the sleepimage and swapfiles should still be intact, is there any way I can force it to try again or something?