The attached advice is from Northorpe Hall (Children and Adolescent Mental Health Services) with the aim of explaining why sleep is important, understanding and creating positive sleep patterns and advice to support with this.
Check out this link with 11 tips for How to get a good nights sleep
Here is a link to support with sleep problems in children:
NHS recommended Sleep Apps
Also, Neon The Ninja is a recommended book for 5-10 year olds who experience nightmares or other sleep-related problems. He looks after anyone who finds the night time scary. Lots of us have nightmares, but Neon loves nothing more than using his special ninja powers to keep the nightmares and worries far away, and to keep the magical dreams and positive thoughts close by. Find out more about Neon the Ninja here.
Place2B also recommend 'Bad Mood Bear' by John Richardson.
You can also access a booklet on 'How to get a better nights sleep' by the Mental Health Foundation below and a sleep hygiene checklist as well as Supporting Children with Additional Needs with sleep.