Normal to be tired with a 2 month old baby?

So I had my son April 14th. He only wakes up once or twice a night now, yet I’m still so tired 🤦🏻‍♀️ my mom has my baby tonight, she has been taking him 1 night every weekend for the past few weeks to give me a break. I’m still young, so when my mom takes him I take that time to party and do things I can’t do when i have my son around.. I was planning on drinking and partying tonight but I’m just so tired and it’s only 9:30 pm I don’t understand why 🤦🏻‍♀️ I know I should go party when I can because i can’t do that much since I had my son but part of me just wants to stay in bed and sleep 🤦🏻‍♀️🤦🏻‍♀️ I don’t wanna let this night go to waste by just sleeping but I think that’s what’s gonna end up happening because I’m just so tired 😞