well, Roscoe's pushing 8 and he can still dig with the best of them. He sleeps good though.
Harley is the same way but Ive kept her from digging until we moved into this house. Theres some little grey mole creature burrowing around and she will try to dig her way to it at times. And she LOVES to sleep. Say its time to go to bed and she runs to the bed.