Does It Really Matter Which Side You Sleep On?

I’m one of those people who can’t get comfortable at night until I’ve rotated through every possible sleeping position, ideally twice. But when I was pregnant, I kept hearing the message that we’re all supposed to sleep on our left side, specifically. On the other hand, there’s research suggesting the right side may be better for people with certain health conditions. Let’s consider all the factors and see whether there’s an optimal side for you. 

Is it good or bad to sleep on your side?