A child who has difficulties going to bed, falling asleep, staying asleep, can make night time a horrible ordeal!
Night waking and challenges in falling asleep are common in children with Autism Spectrum Disorder (ASD). I have used the textbook A Work in Progress as a reference to share a sleep protocol to help children and their families.
The protocol consists of 4 steps:

Download the full slide deck that teaches the four step sleep protocol. There is also a visual bedtime routine picture schedule at the end of the slide deck that can be used at home.

References: Leaf, R. B., & McEachin, J. (1999). A work in progress: Behavior management strategies and a curriculum for intensive behavioral treatment of autism. New York: DRL Books.
Lessonpix used to create the bedtime routine.
Additional link to autism and sleep issues can be found here