Bamboo bra for the night and whether to sleep in a bra
Short answer: It is a habit, not a necessity. If you sleep in a bra, it should be soft and without hard edges, because you lie on it for eight hours.
No medical reason
There is no documented health benefit to sleeping in a bra. For some it is more comfortable, and that is the only reason that counts. See bamboo bra without underwire.
If you do
Choose a soft model with no underwire, no hooks at the back and no hard edges. Anything sticking out becomes a pressure point when you lie on it.
Looser than during the day
A bra for the night does not need to support. It only has to cover and not pull. A bralette or soft top does the same. See bamboo tops for women.
With tenderness in the breast
If the breast is tender, a soft layer can be more comfortable than nothing. Persistent tenderness should be mentioned to your doctor.
The nightwear around it
If the nightwear is soft enough, it can do the same without an extra layer. See bamboo nightwear for women.
Frequently asked questions
Is it healthy to sleep in a bra?
There is no documented benefit. It is purely a question of what is comfortable.
Which model is best for the night?
A soft one with no underwire, hooks or hard edges. You lie on it for eight hours.
Can a top replace a bra at night?
Yes. A soft top or bralette does the same.