I usually stay at the Kempinski when I have an early flight out of MUC. It's located right at the terminal and is very clean and efficient. Great breakfast downstairs in the morning, though $$$.

It's easy to take the train into downtown Munich from the terminal for dinner,w sightseeing, etc.- takes about 30 min - and the next morning you can simply walk over to the check-in desk for your flight.

No MR points, of course, but if the flight is early enough, I'm willing to make that sacrifice to save myself a bit of a hassle before I'm fully ready to face the day...