The ability to freeze time when I'm gaming so I can play absolutely anything I want and not worry about the time it takes.
I wouldn't do that for every game I play, as sometimes time needs to pass, but on occasion it would be nice to be able to play a lot of catch up that way.
Other than that, good old X-ray vision.
Being able to fall asleep instantly and get 8 hours of uninterrupted sleep.
Or at least be able to fall asleep instantly would be amazing.
Freeze time for everyone except myself. Mostly so I can take longer naps at work without getting fired.
Ever seen the 2006 movie Cashback? If I could freeze time like that it'd be something like that movie.