I'm not much of a reviewer but this bra is amazing. I purchased the 34 G in pregnancy and purchased it twice more in postpartum. It's been my go to nursing bra. It's not the most comfortable to sleep in because of its structure and support but you definitely can. It's very well made, supportive and even seems to be a little moisture wicking. It survived a big day walking around New York when I was 29 weeks pregnant and many days of nursing, running errands etc. I haven't worn it for yoga or anything but I suspect it would work with moderate support. My only complaint is that it only comes in black in my size, which makes wearing lighter colors with it tricky.