“The way this pillow is designed, it is not really built for an ergonomic position,” says Jeremy Smith, M.D., of Hoag Orthopedic Institute in Irvine, California. A neck pillow that’s too big for you can put your head and back out of proper alignment. These pillows also hinder movement. “It’s hard to find a comfortable position, even in a perfect-fitting neck pillow,” Smith adds. He advises using “a small, regular pillow.”