What would you do?

My sons nap got messed up today so he only napped for like 30 mins. He will turn 2 in a week. He doesn’t sleep well when he’s overtired and usually his wake time before bed is 5 hrs 45 mins. But that puts him going to bed at 6 pm when he normally goes to bed at 8. I’m worri r he will wake up as if it’s a nap. What should I do? We’re all sick so we really could use the rest tonight