A few things help me

• physical exercise
• phone screens banned
• a caffiene free herbal tea
• calming noises either real or from phone
• reading a physical book or kindle using a tablelamp with no backlight.
• reading a single page of theory (puts me to sleep honestly)
• consistent bed time and wake time
• some basic meditation or breathing exercises can go a long way if you're feeling stressed

I used to have a lot of trouble sleeping but since I've done some of the above i can generally fall asleep consistently at 11pm