Cap Sense ...getting a drowsy PIC to wake out of sleep!!

[Demon]

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5. Any external interrupt

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(that's my bold too - is a Timer interrupt deemed an 'external interrupt'?)
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I'm just reading up on this now too, using the PIC 16F877 as example, check pin RB0/INT.

3.2 PORTB and the TRISB Register
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RB0/INT is an external interrupt input pin and is configured using the INTEDG bit (OPTION_REG<6>).
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p. 33/218

I wished I had more, like a code example, but it's all I found so far (quickie search).

(just one more feature on my list of things to play with)