If you sleep lying on your side and have back pain, the Leg Spacer is the sleep aide for you. When you place the Leg Spacer between your legs, you'll feel reduced strain and stress on your back while sleeping on your side. Sleep right - and you'll sleep tight! Reduces the strain and stress on the back while sleeping by aligning the spine, thus reducing the "torque" applied to the low back. As a result, this simple sleep aid significantly reduces pain and discomfort in the low back.