This is an age old argument as to which is better, going to bed with a bra on or off. To most ladies wearing a bra to bed will cause their breasts to be constrained and prone to bra marks, they also would not want their lymphatic glands to get clogged and therefore causing breast cancer.
Another school of thought believe that wearing bra to bed will help stop your breasts from sagging.
However, from a medical point of view the underarms lymph nodes act as natural filters which help to relieve the breast of any lymph fluid and also gives the breast and body a natural protection from infections.
It is yet to be proven medically whether or not bra constricts lymph node pathways.
Breast sagging is primarily caused by pregnancy, breastfeeding, genetics and age.
Where you use a bra cup size over C, it is advisable to make use of a cup style that is soft and does not require much hardware and tightening.
Whether you sleep with or without a bra has no real bearing on your health. It is only a matter of opinion as to whether wearing a bra helps your health or not.
The type of bra you use can also adversely affect your health as a tight bra for example could cause you to have rashes under your breasts especially with poorly fitted bras.
It also helps if you use a soft cupped bra with natural fiber like pure cotton wireless bra which is great for keeping moisture away from your skin.
Source: Healthy World Recipes