 Scientists can't say for sure, but here's what they say does work. Visualize relaxation, whatever that looks, sounds, feels, smells, or even tastes like to you. Practicing gratitude or counting your blessings, that can also be a really powerful tool. So can putting pen to paper with any problems, solutions, or to-do list items. Anything you can offload from your brain to pick back up on tomorrow. I'm Dr. Sanjay Gupta.