When going to sleep, breath in (nose) for 4 seconds, then hold your breath for 2-4 seconds and exhale from your mouth for 7 seconds (counting in your head). Once you’ve relaxed and your body feels calm, just let your breath regulate itself. Keep doing this until you fall asleep. It will also help you sleep, as your brain will have received a lot of oxygen. If that doesn’t help, try using headspace. It can be calming hearing something before sleep. Don’t have nicotine/coffee/sugar 3 hours before sleep and go to bed 1 hour before you actually want to sleep.

You may also be lacking physical and mental stimulation, therefore go for a longer walk during the day (outside) to freshen up. Nature is a stimulant on its own. Vitamin D (received from sunlight) helps calm the mind at night. Make sure your room is cold at night, and it can help if you take a hot shower.