Wearing a bra at night can be uncomfortable and may restrict movement, leading to disrupted sleep. It can also cause skin irritation due to the fabric rubbing against your body while you sleep. Wearing a bra during the day is beneficial for support, but wearing one at night isn't necessary and could even increase breast tenderness or pain. Furthermore, sleeping without a bra allows breasts to move freely throughout the night, which helps promote lymphatic drainage - this is important for maintaining healthy breast tissue. For these reasons, avoiding wearing a bra at night is best.