If you wake up in the middle of the night, trying to fall back asleep can be tough. Dr. Amir Khan recommends a technique called cognitive shuffling to help. It’s a simple mental exercise that involves listing everyday words to calm your brain and invite sleep mode. Try it for yourself, but if persistent sleep issues persist, talk to your doctor.
Source: https://www.independent.co.uk/bulletin/lifestyle/insomnia-sleep-tricks-advice-doctor-amir-khan-b2921325.html