I've had this problem. Had trouble falling asleep, and when I did sleep I would dream about coding. I don't have this problem anymore. I credit two things with eliminating the problem... 1) Exercise. Preferably in the morning. I do 20 minutes of weight training in the morning, 4 days a week. I follow the StrongLifts 5x5 method. I walk two miles at lunch. 2) Valerian root. I just take it every day 30 minutes before going to sleep. When my head hits the pillow I'm asleep in 60 seconds and I sleep like a rock.