WELCOME and good luck on Monday!
I work out in the AM too...seeems to be better for me! I do however have 1/2 scoope of whey protein about 30 min before I work out with 4 oz of water. I find it helps me a lot. The works out can be hard and if I am starving from the night before I tend to get tired due to lack of food. A study just came out saying it is actually better to have 10g of protein in your system than working out on a empty stomach. But do what works for you!
I also go to the gym at night (I'm doing doubles...but switched it..do P90X in the am and cardio PM). I would only suggest doing cardio at the gym...since this prg is pretty tough and I think double lifting on days (doing the dvd and then lifting at night) could cause over training. But again...do what works for you and listen to your body! I tend to stay up late too...but I would say try to get 8hrs of sleep instead of 6hrs. Sleep is when the body repairs and Growth hormone is released...key to building strength and staying injury free.
As I always suggest...I would keep a log in the forum...it has helped me a TON!
