To nap or be crabby

So the no nap thing (from a couple months ago didn’t last more than a month) buy seems you’re trying it again by not napping until very late (sometimes starting at 4pm). Of course when you do nap that late it messes things up for the evening and you end up going to bed close to 10pm. When you don’t nap you get pretty crabby and even start to ask to sleep even if you don’t fall asleep until 9:30 like tonight.