About sleeping after night training

Hey guys.
First of all, im brazilian and still getting better on my english.

I've been training jiu-jitsu 2x or 3x a week for six months, always at night at 8pm. It's the only time I can go to class because of my work and other commitments. The problem is that I get home after training and my mind only thinks about jiu-jitsu. I can't relax and it takes me a long time to switch off and fall asleep.

I'm in love with BJJ, I'm progressing well and I have no intention of giving up training, but I can't train at any other time and waking up to work at 7 or 8am the next day has become difficult. I know that many of you must train at night and so I ask: any tips on how I can relax and sleep faster? What do you do?