Breathing
Deep breathing can help calm you and can also be helpful when trying to get to sleep. There are several exercises/techniques you can try, to find the one that you like.
- Breathing Exercises To Reduce Stress - Headspace
- BBC Radio 4 - Just One Thing - with Michael Mosley - How to reset your brain with your breathing
There are several available on apps and online, or you may even have a watch with a breathing exercise as one of its features, that you can use any time.
See also Mindfulness and meditation.
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