Sleepy newborn?

For the past few days my one week old has been nursing non stop. Literally, I hand him to his dad for 10 minutes and he’s wanting to nurse again. I don’t mind at all and have kept him nursing as much as he pleases, but today he has been super sleepy. I have had to wake him up almost every feeding today, I feed him every 2 hours. I’m worried because this isn’t like him. If he’s still sleepy like this tomorrow I’m calling his doctor, but until then, any ideas? He’s still getting his diaper counts and everything too.