Hi, I too think that if your comfy it shouldn't be too much of an issue. You will know if your squishing that artery because you will get some pins and needles or numbnes.

Me I'm a tummy sleeper, and am finding it really hard not to sleep on my tummpy. but I wake up on my side, in the fetal position, so I'm going to find it hard when i get bigger. at least in the next few months it will get cooler and make it easier to sleep huggin pillows. I feel sorry for all the ladies trying to sleep now that are due soon.