If your serious you will fit it in where ever you can, whether thats early morning or late night. Some people go to the gym during lunch, shower up, and come back to work so anything is possible.

When I worked out at weird hours I found the key to keeping my energy up was A) plenty of sleep and B) adjusting your meals based around when you train. Preperation is half the battle, eventually your body will adjust to its new schedule so just fit it in when ever you can.