Days are good, Nights are an absolute mess

M'y son is 19 Days old and exclusively breastfed since we removed the nipple shield. Sometimes he would take a couple of tries before staying latched on. no big deal. But the night feeds are awefull... He takes forever to wake up and can latch on n off for 15 min before actually Starting to really feed. Each time. Night feeds can last Up to 2 hours for 35-40 min of actual feeding. I really try to manage myself and stay focused but any advice would be appreciated so I dont loose m'y mind before the 6 Weeks Mark...