Unknown issue; Blue Screens appearing only when waking laptop.

For the last few weeks I have been unable to put my computer to sleep for transport or other general reasons. When I do it appears to be fine but when I open it up and tell it to wake up then it either comes on and blue screens straight away or it comes on as though it's going to work fine but there is a spike in CPU usage (according to the desktop gadget) and then in the next few minutes it either freezes or blue screens.

If I shut the computer down instead of putting it to sleep then it is fine booting up, however, when it tries to automatically restart if it has been put on sleep then it sometimes fails to start and suggests launching start-up repair. If I select start normally then it usually is ok but if I turn the computer off for a few seconds and then try to boot it as normal then it is always ok.

Once the computer is running it never shows any signs of a problem and can run for an entire day without issue. There are no speed issues and there are no programs which don't work.

If it is relevant, so far these blue screens have had at least 5 different titles including 'INTERRUPT_EXCEPTION_NOT_HANDLED', 'BAD_POOL_HEADING' and 'IRQL_NOT_LESS_OR_EQUAL' I can't remember the others right now.

Basically I was just wondering if this is an issue I should be worried about getting worse because right now I can deal with shutting the computer down every night until I can get a new machine in October but if it's going to get worse then I want to be prepared or fix it preemptively.

FYI:
My system is 2 years old in August.
It had its hard-drive replaced about a year ago.
The OS was originally installed on the laptop, I assume (obviously) that it was reinstalled when the new HDD was put in so the installation is ~ 1 year old.