Is It OK to Wear a Bra to Sleep? Experts Weigh In

Bras were designed to support the chest and take pressure off the back during daily activities. However, some people with bigger breasts need to relieve pressure from their back while they sleep, too, Wong said.

Wearing a bra at night can support the breasts and keep them from excessively moving, which may alleviate pressure from your back, she said. If you wake up with a sore lower or upper back, neck pain, or stiff upper-body muscles, she suggested wearing a well-fitting bra to bed.

If your breasts swell or nipples become tender a few days before your period due to an increase of oestrogen and progesterone in your system, Wong said you may want to experiment wearing a bra to sleep on those nights.

Some people are woken up by breast tenderness—especially if they are stomach sleepers or move around in their sleep, she explained. "If you get tender breasts at a certain time of the month, sleeping in a bra may help alleviate your symptoms, making you more comfortable", she said.

If one or both of your nipples are pierced, Alexander Zuriarrain, a board-certified plastic surgeon, recommended sleeping with a bra on.

"The movement that occurs when a person is sleeping can lead to the piercing getting caught and tearing the delicate tissue of the nipple", he said.

Bear in mind that people don't always know whether or not they move in their sleep. "When we enter REM (or deep) sleep, we have no idea what we are doing", he said.

To be very clear: all breasts are good breasts—and that is true for breasts of all shapes, sizes, colours and weights.

However, some people prefer the aesthetic of perkier breasts on their own body. If you fall into this camp, you might consider wearing a bra to bed. "Wearing a bra to bed may reduce sagging", Zuriarrain said. The bra can help keep each breast from hanging, falling or dropping to one side or another during the hours that you're asleep, he explained.

That said, even if you do choose to wear a bra to bed, your breasts will probably sag over time. Breasts naturally sag due to a variety of factors such as hormones, weight and age, according to Zuriarrain.

"Pregnancy, menopause and lactation often cause changes in the breast shape and weight", he said. "Lactation causes significant sagging of the breast as well as the process of pregnancy due to the engorgement of the breast, which leads to stretching of the skin".

Menopause also causes thinning of the skin during the ageing process that can also lead to sag, Zuriarrain said.

"Bras were designed to be tight around the chest", Blessen Abraham, DC, said. While this tightness allows the bra to effectively support your chest when standing up, when lying down it could become an issue.

"When you're lying down [and] sleeping on your back, the band of the bra can shift to the centre of your chest", he said. "Typically, this shift prevents your ribcage from expanding fully, which it needs to do so you can breathe properly".

The result? You sleep less soundly. If you wake up tired and think your bra could be to blame, consider going to bed without.

There's a reason many people wear oversized T-shirts or fluffy pyjamas to bed: they're comfortable. But, sleeping with a bra on may not be—and that's OK.

"The main downside of sleeping with a bra on is it's less comfortable than sleeping without a bra on for some people", Chen said.

Your move: if you find sleeping with a bra uncomfortable, stop wearing one. It's as simple as that.

Just as too-tight tops or trousers can cause sweat, so can a too-tight bra, according to Chen. And trapped sweat can increase the risk of smell, irritation and even yeast growth.

If you find yourself waking up with puddles between your breasts, consider sleeping without a bra. Another option? Swap your sleep bra out for one made from cotton, which is generally more breathable, Chen suggests.