D.M.
T.,
Here's what I do...
In the morning my son wakes up at 6am roughly, and I get up about 5.45am and just to some basic stretches, squats and minimal strength training. Then, at nigth we eat dinner at 5.30pm and he goes to bed around 7.30pm. Once he's snug in his bed and asleep I do cardio and light strength training.
My friend who's a fitness trainer said that the metabolism slows down while you sleep, so doing the workout before bed is like giving it a jumpstart. And, doing the small stuff in the a.m. just gets the body going.
I found that I'm not as pooped as when I got up at 5am to do the full workout and it works better with my schedule.