Sleep with a cervical pillow.
Cervical pillows, or orthopedic pillows, are contoured to support the spaces under the head and neck with deeper depressions where the head lies and extra support is provided under the neck. They help keep the neck in alignment with the spine
Sleep on your back.
Sleeping on your back is the best position to let your entire spine rest comfortably. If you prefer to sleep on your side or on your stomach, make sure your pillow is not too high-around 4 to 6 inches thick. This will prevent your head and neck from turning unnaturally to either side.