It's probably the hybernation file, have you googled the problem at all?
I would start with turning the hybernation options off, cleaning out all temporary files for Windows, IE, Firefox, etc... Then I would turn off temp files for your browsers just for good housekeeping. Once you have hybernation off, you should be able to remove the hybernation file (it's a large file in the root of the C:/ drive usually. It's not named 'pagefile' which is your computers virtual memory or 'paging' file; don't delete that one.
Seriously, google's your friend here...
Windows 7 won't wake up after sleep
Sleep and hibernation: frequently asked questions
So the answer is, "yes, unless you're lazy and don't want to read."