I prefer to get all my working out done in the morning that way I have the rest of the day for school work (at the moment). I envy those who can do super early mornings consistently. I know that for me if I get up for a reason I actually awake with a decent amount of energy, the real problem is not just falling back into a pattern of relaxing because i am a creature of comfort most definitely.
One early ride though was the Boston Marathon ghost ride. I got up at 5am for that one.
In general morning rides rev me up and substitute for my cup of tea. This morning I did a 7:30 - 8:30 trainer ride (Yeah I know trainer season is over but atleast when you have a 9am meeting you can still get a ride in and not worry about possible complications making you late). I certainly find that if you get going with a hard effort initially and really force your heart rate up to the red zone you warm up quicker, that might be a tip.