We attempted to do this on 3/19. DH set the alarm for 5am, because we were taking the bus from POR. Unfortunately, I stayed up until at least midnight the night before, because we got in late from the 2nd F! show and I was reading the boards before bed.
Well, I roll over the next morning and look at the alarm clock. It says 6:30am. Crap! We were supposed to be on the bus or even at MK by then. DH had slept through the alarm on his phone, even though it kept going off every so often. I showered and got ready faster than I ever have before. I am sure I missed something though. After waiting for the bus in the dark with other grumpy families, we still managed to get into the park by 7:30am. Not too bad. The park was not very busy until 10am or a little later. Next time, I am setting the alarm.