Sudden slow down after an auto-shutdown - kernel_task running hot.

Hi,
I was playing Braid on supremely low battery, and my MacBook Pro 13" (Early 2011) running 10.7.2, automatically turned off. Plugged it into the charger and went to bed. Booted it up next morning and it is so incredibally slow. No warning, no gradual slow down, just all of a sudden. No peripherals attached at all.
Checked my Activity Monitor, kernal_task is running at 330mbs, from what I've seen that is pretty bad. That's the only thing I can see that is out of the ordinary.
Anyone want to take a stab at the cause of this sudden slow down? It's making using my laptop very very tedious.

Note: In Safe Mode kernal_task is running at 220mbs. Is that a clue? I don't know.

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