Your spine should be straight while still maintaining its natural curve when you are sleeping. This is the proper posture that can help reduce neck pain. Two sleeping positions that can help achieve this posture and be much easier on your neck are side and back sleeping.
When sleeping on the back, you need a pillow that has a contour that will support your neck’s natural curve with an indentation to hold the back of your head.
When sleeping on your side, your neck and spine should be aligned straight. Therefore, you will need a thick pillow which is higher under your neck compared to your head. This will allow your shoulder to tuck slightly under the pillow and as such provide the best support possible.