NHS Choices has some great information about sleep and bedtime rituals, please click here.
Poor sleep patterns? Why and how to help your child: https://www.todaysparent.com/toddler/sleep-solutions-for-all-ages/
You may also find these tips for children helpful. Why not play this ‘Who needs the most sleep?’ game for younger children? kidshealth.org/en/kids/not-tired
Sleep film aimed at younger children:
Sleep video for older children: