It may be the position you are sleeping in is placing too much pressure on your spine. Some people have more of an arched back posture and if they lay on their stomach, this can happen and they wake up stiff, painful and sore. If you can try sleeping in another position do so and if you are sleeping on your back, try and elevate your knees so they are bent at a 90 degree angle (almost like you are in a seated position while laying down).
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I have a similiar pain, but mine is arthritis. I've had an MRI and found out that it was something that I have to live with. I try to sleep on my side, but sometimes it's so bad, that I get up and sleep in a recliner chair. Good luck to you!