Breastfeeding sessions decreasing?

Hi guys! I have some questions that’s I can’t get answers from google for 🤦‍♀️ This is my second child but my first time being able to breastfeed (my first son wouldn’t latch to save my life so I never got the privilege) but my milk has finally came in (yay! 🙌🎉) But my son has cut down his feeding times so much, he use to stay on the breast for 20-26 minutes and now he’s staying in for like 10 minutes, he eats completely burps and goes to sleep. I just wanna make sure this is normal, I try to wake him back up but he’s a goner and won’t open his mouth to save my life and if I try he’ll bite my nipple.