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How to Train Yourself to Sleep on Your Side

Select the Right Pillow and Mattress
Make sure the pillow is firm enough to provide adequate neck support.
Mattresses should be softer to reduce pressure on the shoulders and hips.
Place a pillow between your knees to help support your hips and lower back.
Consider using a body pillow to help you maintain a comfortable side-sleeping position.
Try Sleeping on the Couch
Couches are usually narrow, making them more suited for side sleeping, so it can be a good starting point for adjusting your position.