He's not always been like this; he's always been funny and made us laugh but he was mostly quite a sensible little boy. He had a really hard time in year 1 (undiagnosed SEN, maybe ASD) and developed a class clown persona to make the other kids at school like him and it's spiralled from there. It's 100% a tactic he uses to hide the fact he's struggling to keep up with the other kids.
He's now 8 and it's reached the point where I'm finding it very hard work to spend 1-1 time with him because he is so over-the-top silly. For example, I'll be trying to have a conversation with him about something (doesn't matter what the topic is) and all he'll reply with is the word 'apples' or whatever, usually while bouncing about all over the place, getting right in my face, etc. I wouldn't mind the occasional nonsense conversation with him but the majority of the interactions I have with him now are like this.
I'm not looking to change his behaviour at school , but I'd really like to get him to the point where he can relax and be himself at home. Does anyone have any advice? I've tried all the obvious things I can think of to encourage him to dial it down a bit but it's clear he finds it really hard to just be himself.