N.W.
totally normal. My daughter, who is now 7 months, is the same way. She's very curious and doesn't want to miss anything so even when she's tired, she fights sleeping. Their patterns change a lot depending on growth spurts and their individual development. Once we sleep trained her at 5 months, she was better about going down for naps but still, one day she'll nap for 2 hours and the next 40 minutes. It's always changing and our pediatrician says it's perfectly fine. I think, as long as your baby is sleeping well at night, you're in great shape. Consider yourself lucky!