Sleeping 3 week old??

My 24 day old baby is sleeping tonight. Im not used to this. Especially at night, he had recently been demand feeding 2 oz almost every hour and a half. Tonight he’s been mostly wanting to sleep. I woke him up to change him and he nursed one side for 15 minutes, then went back to sleep. He woke up 2 hrs later and nursed for 10 minutes then went back to sleep. I am used to him nursing 45 minutes a side, so its really strange to me. Is this normal? I have a bottle of expressed milk I plan on giving him when he stirs again, or Ill wake him.