Ever wonder what it is like being the youngest? He will be 1 day short of 6 weeks on the Saturday visit. You won't see a difference, I am sure except he goes to sleep earlier. How much they sleep is a development thing and they sleep less as they get older.
But as I check the camera throughout the night, they are sleeping the night. This morning they wanted us to get up at 6am vs 7am. We are conditioning them to sleep till 7.