Moar this than I can upvote. Getting in early changes your entire day. Sure, you sleep less, but unless you have an acute medical condition you can get used to it within a week or so.
The only thing that might motivate me to wake earlier in this situation is to search for a job that didn't try to suck my brain away - very worthwhile.
7 hours minimum now and no stimulants (alcohol, caffeine, masses of sugar etc) and lots of water. Made a bigger difference to me than an exercise regime.