Not sleeping through the night anymore

My 2.5 yo stopped sleeping through the night about 2 weeks ago. He constantly is waking up at 1 or 2 am. Not sure what to do anymore, because he’ll wake up, come to our room or the living room, but will want to play for a few hours. He is tried but constantly fighting his sleep. It’s really messing up his sleep pattern. He use to have a solid sleep schedule. He does go to bed full and goes to bed on his routine still at 8:30 pm. He still gets up at 6:30ish to go to daycare, but then falls asleep at daycare around 9 or 10 am. Then he won’t nap until 2. Or other thing is he’ll nap at normal time but will nap way too long. I know he needs his sleep but I’m losing sleep because at work I can’t nap.