Waking Up

My first class is at 7:30 am each morning. It takes me about 10 minutes to walk to class, so I need to be ready to leave by 7:20. Before I went to sleep last night, I pondered about the setting on my alarm clock. Should I set it for 6:00 and hit snooze a few times, or would I go for the 'can't hit snooze or you might be late' setting of 6:30? I set it for 6:30, heard the alarm go off, and hit snooze. I still managed to make it to class on time. So now I'm pondering if I should just move that up to 6:45, thus saving me one interruption from my sleep. But I also realize that will mean I likely will be late... 35 mins is hardly enough time to prepare. What a difference 15 minutes makes, eh?