Some background:
DS is 6 with ASD and S&L problems. He's done massively well from only having 25 words at 3 yrs old to full sentences now.
We get lots of echolalia (which is useful for finding out what's been said to him at school!) but also random 'stories'. Mostly based on Toy Story or Thomas. He starts this usually as we leave school. He doesn't usually require any interjections but sometimes I join in to be sociable. I put it down to wanting to say something but not knowing what to say, maybe?
He's 'with us' sometimes - asking about stuff around him, making comments, playing, having some sort of conversation.
And then, hit about 5pm and he's back into his world again. Is this stimming? Is he expressing his internal dialogue? He talks to himself in bed as he goes to sleep, as he wakes up..
I'm having a moan btw - with his language problems we never thought he'd talk so much!