I have ADHD with sensory processing issues rather than autism, but have had insomnia my entire life. It’s extremely hard to fall asleep if I can hear any noises like TV or traffic, even jus a little over earplugs amd a white noise machine. I don’t have a solution other than pills that are probably affecting my quality of sleep. Melatonin not only didn’t work, but gave me a paradoxical reaction and kept me up until 4 AM. A doctor even told me that maybe once I get old and start to lose my hearing, I’ll finally get decent sleep.