My 5 year old DS has been diagnosed with AS since starting school. generally we do not see a great deal of issues at home as I think he feels safe here but in the last few weeks he is finding it impossible to wind down & go to sleep. taking 2-3 hours from lights out & he is getting more & more tired leading to more & more difficult days at school which in turn contribute to him finding it hard to wind down etc. Bedtime routine hasn't changed. Any ideas for things I could try to help him