I am probably going to sound crazy, but I guess that's nothing new for me...
My ds8 is a dreamer. Big time. he is also a doodler, like his mom.
I think that daydreaming is a massively important part of the creative process...the way we humans come up with some of our biggest ideas!!
I am not advocating for a kid being bored to tears in school, but I do encourage my son to feel comfortable about daydreaming, and doodling.
Since he loves to draw anyway, and often finishes his work earlier than other kids, I am ok with his stuff coming back with lots of drawings on it. I do emphasis that he's got to get the work done first, however!
So far at least, no complaints from teachers.
When we're driving I usually try to engage him in conversation but sometimes he'll tell me very politely that he'd rather just daydream than chat. This can be a bit frustrating for me, but usually I am ok with it...I dont know if this is really an 'approved' concept
but I do think it's a good skill to have.
