Sleeping newborn

My son is a scary good sleeper. He does one good 5 to 6hour stretch every day it's just trying to time it right for me to also sleep. He is growing so well to! He was born at 9 pounds 6oz and at 4 weeks old already 12 pounds.

Problem is once he has that he takes hours to fall asleep after each sleep. Minimum of an hour and he will sometimes be up for 3. It blows my mind. And it's the worst when he is up in the middle of the night for that long cause it's the only chance I have to sleep since my first born is an early 6am riser.