Muscle pain while sleeping can be caused by a variety of factors, including poor sleep posture, overuse, or underlying medical conditions.
Why Sleeping on Your Side Kills Your Shoulder
Is Back Pain Keeping You Awake at Night?
Sore Neck When Sleeping
Causes and Treatments for Nighttime Back Pain – What you Should Know
How to Sleep With Intercostal Muscle Strain - PMIR
Do you have pain in the middle back after sleeping? - Dorsoo
Lower & Upper Back Pain After Sleeping (Morning Back Pain)
Lower Back Pain When Lying Down: Causes and Treatments
How to Treat and Prevent Stiff Neck After Sleeping