He must have been very tired

Isaac ate at 10pm last night, and he fell asleep around 10:30. I am very accustomed to him sleeping for about 3-4 hours and then waking up to eat. I woke up at 4:45am and looked at my clock...I had to rush to his bassinet to be sure he was still breathing! I actually woke him up while doing it...who knows how long he would have slept! What did I learn? As much as I would LOVE to sleep longer than he usually lets me, any changes like that cause a mild amount of panic in my heart...which is probably just as it should be.