Formula and breast feeding??

So I’m a single parent and my baby is 2 weeks old, I am soooo exhausted during the nights getting up to change his diaper and to cradle him and stay up with him when he’s awake and especially breast feeding him while I’m half asleep I fall asleep with him on my breast sooo much, would I be a bad mom to give him formula at night and just breast feed during the day just to give myself a little break at night? Breast feeding takes a long time and is so exhausting. Idk what do you guys think? Should I do both ? Or just try to stick it out and only breast feed?