Well, I've plowed the manual until my eyes are blurry with no joy, so I thought I'd ask the experts:

I'm using an 18F2580. I have an external device that every once in awhile toggles asynchronously. I'm using the Timer3 input to count those toggles. Everything works as expected.

Now I'd like to save some power. If I put the device to sleep for 30 seconds will it miss toggles on the Timer3 input while sleeping, or not?

Thanks for any insight - testing it is sort of painful because of the board layout, but track cutting might be my next step after this...