DS5 has trouble turning his brain off too. He stopped napping before age 2, though he does nap every once in a blue moon now (more than he did from age 2-4). He and DD3 go to bed by 8:30 during the week, but that may change when he starts K this fall.

Like Master of None, the more physical exercise DS5 gets, the quicker he goes to sleep, so we do physical activities as much as possible.

I think it's ok to allow your DS to read for a bit, but I would give him a time limit.