This is one debate that will rage till eternity. While most ladies avoid wearing a bra when going to bed to avoid marks, the “constricted” feeling and even the fear of blocking the lymphatic glands leading to breast cancer, there are the religious nighttime-bra-wearers (like Marilyn Monroe) who strongly believe that it prevents their breasts from sagging. Scientifically both of these assumptions are myths at best.
Lymph nodes in the underarms act as natural filters that drain the breast of lymph fluid, and are the body’s first defense against infection, foreign material, and cancer cells. Studies have not been able to prove that wearing a bra constricts the pathways of the lymph nodes. So get the breast cancer fear out of your mind.