Baby still sleeping?

Has anyone's LO slept a lot and still went to bed at a good time? My son is 10 weeks, I usually put him to bed around 8-9. Which last night he fell asleep around 9, but kind of woke up off and on but fell asleep just after 11:30 and slept until 8am. Then he fell back asleep after he ate. Woke up around 10ish didn't stay up too long before he slept again, then woke up then fell back asleep around 11:30ish and had been sleeping since. I'm sure he's probably just growing but I don't want him to not sleep tonight, but I don't know if I should try to wake him up or not.