I used to have trouble sleeping almost every night with my anxious thoughts. I would just run through terrible scenarios over and over. At some point, someone taught me that one way to reduce my anxiety and to sleep was to try to replace those anxious thoughts with thoughts of gratitude. When I can't sleep, I try to think of 5 things that I am grateful for. Always make a fresh list, not just what you thought of the night before or something. Then repeat the list over and over in your mind. This will be really hard at first. Your brain has been trained to think those terrible anxious thoughts. You'll be retraining your brain to think about gratitude instead of anxiety. The more you do it, the easier it will get. It seems like it's too simple to work, but it does. I've never heard of anyone staying awake at night thinking about all the stuff they're thankful for.