Autism, and anti social behaviour.

A few weeks ago we have had a letter from our landlord about complaints of anti social behaviour from our neighbours. The complaints were regarding noise nuisance. We have 3 children, 9yrs, 5yrs, 3yrs, and they are all boys. Our 5 year old son was diagnosed with ASD, and global development delay 2 years ago. Our neighbours were claiming that we were banging on walls, slamming doors. Theses claims are a total lie, we have never done what they were claiming. The landlord (housing association) did there investigation, and we started mediation with next door. All the sudden the plot changed to our children being noisy. Now I understand that there is what would be considered general household noise, and the noise that children make is included in this. I think the real issue here is our autistic 5 year old who can be very rowdy sometimes, and he will sometimes wake up in the early hours. (4am+) My question is would his behaviour be classed as anti social behaviour if he was having a bad day as some autistic children do?

Any advice would be welcomed.