Cluster feeding

Hello everyone. So I just had my second baby Monday and I am not sure if he has his nights and days mixed up because he will take feeds fine during the day and sleep but then when it’s nighttime all he wants to do is cluster feed every 1.5 hours! I can’t even take a break or get in sleep because he’s constantly hungry. Is there something I can do to fix this? My milk just came in today but before I was giving him 1-2 oz of formula. For the record my first baby didn’t do this so this is something new for me.