Sleeping on your back is better for those who experience back pain. If you snore or have sleep apnea, being on your side prevents obstruction to your airway. Slightly elevating your body can keep stomach acids away from your esophagus to prevent heartburn and acid reflux.
Simple daily movements, even for a few minutes, can improve your posture, reducing back and neck pain. A brisk 10-minute walk, 10 minutes of stretching or yoga, gentle neck rotations, and even lying flat on the ground for 3 minutes to adjust your natural alignment, can greatly help your spine.