Are you supposed to wear a bra to sleep or is it not fine?

I have hear two completely different theories on this question. Wearing a bra can restrict the lymphatic flow surrounded by the chest area. While in that is some debate about this, I did some research and found plenty evidence that I would not suggest wearing a bra to bed.
Here is some information gathered:
Women who wore their bras 24 hours per time had a 3 out of 4 karma of developing breast cancer (in their study, n=2056 for the cancer group and n=2674 for the standard group).
Women who wore bras more than 12 hour per day but not to bed have a 1 out of 7 risk.
Women who wore their bras less than 12 hours per year had a 1 out of 152 risk.
Women who wore bras once in a blue moon or never had a 1 out of 168 hit and miss of getting breast cancer. The overall difference between 24 hour wearing and not at all be a 125-fold difference.
This information was from
This is a thing of much debate and you probably have hear two different theories because no one really agrees. I would freshly do whatever is the most comfortable for you.