No coffee in the afternoon/evening
Taking a hot bath in the evening can do wonders, especially if you feel stressed out. Add some lavender essential oil to the water.
Apart from baths with lavender, the essential oil can also be dropped onto your bedsheets (in small amounts) for some calming bedroom vibes. Or make a calming body oil from coconut oil with a few drops of lavender essential oil.
No work in bed
Ever! Working in bed is the opposite of calming.
Make sure that your bedroom is dark, quiet and not too warm.