There is no medical reason to intentionally sleep or not sleep in a bra. As a matter of comfort most women prefer to take them off at night.
No, because women wear bra to look their breast more comfortable, tight, big and sexy.
Yes. Many women do.
no
Yes.
Yes.
You can purchase a sleep bra from various women's clothing websites online. You will be able to purchase it after you submit a validated electronic payment.
Yes, it cuts off circulation from flowing easily. Unless, your bra does not have an underwire and fits comfortable when you sleep.
You should take your bra off when you shower and when you sleep. You should also take it off when you get home if it is more comfortable not to wear it.
You should look for a push up bra or a bra that has a thin coverage to prevent lines under clothes.
It is recommended for women to sleep braless at night because sleeping with a bra might cause pain and irritation on a woman's breast. Sleeping braless is a good way of avoiding this.
If you are a boy who does not know what to do with a bra, you should give any bra you have back to its owner. If you are curious about bras, just know that they're something women wear to support their boobs.