Certain people involved in tai chi have told me it's beneficial to practice upon rising before you take a meal and then shortly before going to bed. I really don't have time these days to practice twice, so I don't follow their advice but I always thought it was an idea that had some merit.
I do my conditioning (strrenght and cardio) first thing in the morning. I find thatI have a hard time getting motivared later in the day and don't have as much energy after work. Technique training tends to happen in the evenings, but that's when classes are.
If I have insomnia I'll go to the Y around 5 or 6 am (since I'm not doing anything else at that hour anyway.) Otherwise, I find myself gravitating toward the gym in mid-afternoon. It's when I get sleepy, and I want to perk myself up. I also like that it gives me a good appetite for dinner. :angel: