If your child is having difficulty sleeping you may find the links below helpful.
https://www.ambitiousaboutautism.org.uk/understanding-autism/health/sleep
https://www.autism.org.uk/about/health/sleep.aspx
https://www.autism.com/sleeplessness_king
https://www.psychologytoday.com/us/blog/aristotles-child/201107/sleepa-parents-dream