If you could have any superpower, what would you chose and why?

I'd really like to be able to stop the time and decide which people, including me, can go on moving. Life would be so much easier if I only had this superpower! Everyday I could sleep as long as I feel like, decide on the duration of weekends when I have a good time with my friends, make happy moments last longer, have enough time for important decisions at short notice, have more preparation time for oral exams and eventually, I would never ever miss a train or bus again. That would be so cool :-)