This thread might be better placed in the special needs forum board, or the teens one.
I assume you mean being taken to court by school? You do, indeed, have a legal obligation to get your child to school and 'I couldn't get him out of bed' is not going to be an acceptable reason for an authorised absence by most local authorities and schools.
So it absolutely is necessary to tackle this. It will be significantly impacting his education and long term prospects and as a minor, the responsibility is placed on the parent rather than the child to get him to school.
So what to do?
The main issue i would imagine you will have is that he is used to knowing he can stay in bed and nobody will make him get up and go to school. So while ever he knows it is optional, he may well just refuse. The key will be making going to school not optional.
Some obvious things would be:
- make bedtime earlier
- restrict phone/screen use for 1h before bed.
- No phones/screens in the bedroom overnight.
- get him an alarm clock so that gettibg up is his responsibility not yours
One thing my Mum used to do when I was a teenager was to bring me breakfast in bed every weekday. Sounds like an odd way to enforce a get-up time, but it taught me that (a) soggy cereal isn't nice, so eat it quickly (b) eating the moment I wake also isn't nice, so setting an alarm 10m before breakfast in bed arrived meant I had enough time to come round before eating (c) the 15 minutes I stayed in bed eating breakfast gave me enough anti-social alone time to wake up properly so I was more sociable when I actually got up