I am the kind of person who can't sleep with just one pillow. I need to have a pillow in between my legs and another one on my side. I also observed it could reduce back pain everytime I have one in between my legs. It just feels comfortable that way. That's why pillows are that important to me. I tend to have unwanted back pains especially after giving birth. Having a comfortable bed to sleep on and comfy pillows to accomodate my sleep position really helps a lot.