DS1 goes to bed at 8 and gets up at 6. That makes 10 hours' sleep a night.
But I don't think he's getting enough sleep as he's often very tired in the day, even just after getting up, and he's often very miserable and weepy.
He shares a bedroom with DS2, who gets the same amount of sleep and is fine. It's usually DS1 who wakes DS2 in the morning.
I've tried putting him to bed earlier - he just gets up earlier - and we've got blackout curtains so i don't know what to try.