In the first place, bras can be quite constricting, and if you’re wearing a bra that fits tightly against your skin, you’re actually hindering the circulation in your body.
Further, bras can also squeeze and tighten the area around your diaphragm and put unnecessary pressure on your chest, which can make it more difficult for you to breathe throughout the night.
In addition, your bra’s underwire, straps, and hooks have the potential to dig deeply into your skin, which can lead to indentations, irritations, welts, and even cysts. And if that’s not distressing enough, wearing a bra to bed is also increasing your likelihood of developing a fungal infection, especially if your bedroom is on the warmer side or if you live in a humid climate. And when it comes to the quality of your sleep itself, wearing a bra to bed has also been linked to sleeplessness, as it can hamper your ability to achieve a truly deep sleep state.