There's no right or wrong answer to whether you should wear a bra to bed. It's a personal choice based on comfort and preference. Wearing a bra while sleeping won't make your breasts perkier, but it might be more comfortable for some people, especially after breast surgery or during breastfeeding.
However, underwired bras are not recommended for sleeping, as they can restrict movement and potentially cause discomfort or bruising. Soft, non-underwired bras or bralettes might be a better option if you prefer the support of a bra while sleeping.
Ultimately, the decision is yours. If you find it comfortable and helpful, go for it! If you prefer to sleep without a bra, that's fine too.