My 4 year old daughter has severe (level 3) autism. She has a very strict schedule/routine with her wakeup, meals, bath, and bedtime at exactly the same time everyday. Her mind is on her biological clock so every time the time changes, it's about 2 weeks of hell getting her to adapt. This whole week, I wake her up at 7am, like usual, but it's 6am in her mind and she's not having any of it. It's a meltdown every morning getting her to wake up and get her dressed for school. Going to a permanent time schedule is a godsend.