Getting 3 week old on sleep schedule

My 3 week old son was born 2 weeks early. He is breastfed exclusively an im trying to get him on a sleep schedule at night.. He is a sleepy eater due to being early so he will fall asleep eating alot so then he will wake up every hour some nights to eat.. only a select few times has he slept for 2 hours without waking up. Any tips or suggestions on what I can do to regulate his sleep schedule and get him to sleep longer at night. This momma is beyond exhausted 😴 😩