Great story.
A good friend of ours, their son (6 yrs) is like yours who does many things and does pretty well, that kid gets about 8 hours of sleep each day (10pm to 6am) and he is fine. My son (7) goes to bed at 8pm to 7am (about 11 hours) and can not do that much stuff. My son needs 11 hours and will not function if he only gets 8 hours of sleep.
Wonder how you/the boy can manage to do so many things. What time does he go to bed and how many hours of sleep each day?