Mouse and Keyboard stop working since Upgrade to Leopard

I upgraded to Leopard on Friday. Twice today, I've had problems with the mouse/keyboard freezing me out of my MBP. I never had this issue prior to upgrading. The first time today, both the KB and mouse quit. Later in the day, just the KB. Both times were after periods of inactivity. I don't remember the exact scenario leading up to it, but in both cases, a reboot fixed it. I don't have enough detail to (in my mind) justify a trip to the genius bar, but maybe someone else out there has seen this and solved the mystery?

Cheers...