Hi Michel,
I know I am new here, but I think I can help you with this matter.
Most of us as I believe have bad days, where memories come back to us, and just take control of our brain. Nothing will help you fall asleep even the strongest medicine. I personally used the strongest medicine available, that is almost illegal to help me sleep, and also it didnt work. The best thing that helped me is working out. Well, I dont really work out, but when I feel down I go to the Jim and work out for an hour or two, take a hot shower, then you will fall asleep like a baby.
Try it. I hope it will work out.