I saw a technique on social media about how to turn your brain off. So far it has helped me. You take a word like REST. Now starting R find 3-4 words starting with R. Like Ready, Rosemary, Regal. Then move to the next letter E. Everyone, Energy, Exciting. Next S - Sweet, Save, Snacks. Finally T - Talk, Tube & Tunnel. If you are still awake move on to another word. I try to keep my words positive. One night when I was in a bad mood my words were all negative. Good luck!