Mattress and pillow: If you have soft mattress and/or a firm pillow, you introduce a 'hammock effect' into your lower back which can cause spasm. There is nothing wrong with sleeping on your stomach. I would recommend getting a new pillow first. You will notice that they come in soft, medium, and firm. They will also tell you what type of sleeper for which they are designed (side, back, or stomach sleeper).
Answered 3/20/2019
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