Can I not wear a bra

🐘🐘🐘 • 👧🏼 born 1/19/16. 👼🏼 lost 9/15/17. 👼🏼 lost 11/26/17.
I can't afford a nursing bra and my sports bras are cutting into my shoulders, I have terrible pain because of it. Is it possible to sleep without a bra on? I'm up to feed every 2-3 hours anyways