This article discusses at length the prospect of wearing a bra while sleeping and the possible effects of it.
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Is It Bad to Sleep In a Bra? The Pros and Cons, Plus the Best Sleep Bras
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Is It Bad to Sleep in a Bra? It Depends on the Bra (Here's What to Avoid)
Should You Wear a Bra to Bed?
The Pros and Cons of Wearing a Bra to Bed, With Advice From a Doctor
What actually happens if you sleep with your bra on?
Should I wear a bra at night?