Hi MOvingon!
Congrats on making this commitment and sticking with it! Waking up at 5 is hard. Think about it -- going to bed at 9:30 only gives you 7.5 hours of sleep, so that's not an unreasonable schedule as far as amount of sleep.
It might help to go ahead and go to bed nice and early for at least the first few weeks. Your body is adjusting to both a new sleep schedule and a new exercise regimen, so it wouldn't hurt to give yourself lots of rest. If you find it hard to fit into your lifestyle (I have three kids, so I SAVOR those quiet nighttime hours and am loathe to give them up), you could start staying up later, little by little, in a few weeks.
There are studies that show it is harder to lose weight when you don't get enough sleep. That always makes me snicker because I haven't gotten much decent sleep in the past 7 years,
and especially not the past 1.5 years (age of my youngest). Be good to yourself!