no naps anymore ?

My little man turned 6 months on July 25th and he doesn't nap and also will not go to bed untill 9/10 and he's up at 7:30/8 he's a very wired little dude ! We play all day long we are outside a lot and have done everything I can think of to tucker him out during the day ! I'm just curious if anyone else has such an energetic little one ? Sometimes he will pass out in the car but as soon as that car shuts off he's wide awake ready to go ! Should I be concerned he doesn't sleep a lot ?