Do I have to wear a bra at night? There's no need to wear a bra at night. Most girls and women take them off to sleep. But wearing one at night won't hurt you or change the way your breasts will grow. See more Personal Questions Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.