When can I sleep on my side after BR?

I tell my patients that they don't have to sleep on their back or sit up all night after breast reduction surgery. They can sleep any way they want from the night of surgery on, including on their stomach or side, if they are comfortable enough. Your stitches won't pull apart if you sleep on them. That's because the deep tissue is brought together with multiple layers of thick, braided stitches that take about three months to dissolve.

Hi. 
Thank you for your question. I would recommend you to follow the post operative instructions of your surgeon since this a question where all doctors have different opinions. 
I recommend my patients to sleep on their back with 2 pillows for 10-14 days after surgery. After that the patient can sleep as she likes as long as it is not causing pain or discomfort in the breasts.
All the best
Dr Marco Carmona MD 

This is a very interesting question and I believe that if you ask 10 surgeons they will each answer differently therefore I defer this one to your surgeon.  Ask him and he will give you his/her post op regimen