It is not uncommon for a child with autism to have ADHD. attention span is an issue with autism. I know several children with autism that have a very short attention span. for instance one child i know cant sit still at anything for more than a minute. You may have to slowly introduce the hearing aides. just have him wear them for short periods of time--start with 5 min and slowly work your way up to all day and then all the time. it helps if you have a timer that beeps.( this proceedure is called shaping)

It is possible that your 5 year old is "copying" children learn by immitation. It may be just what he is doing.

Let's consider the multitude of school vaccinations, alone, containing highly toxic mercury as a preservative and goes right for the brain. Dental amalgams lose 50% of their mercury content throughout one's life as a gas and goes from lungs directly to the brain. And this is just one element. After some combing my findings are that children are not being cared for any better than when these issues were almost unknown, either on the preventative or treatment level in the public domain.