Brigadier and WWTurkeys. First thing I did was buy a new mattress but didn't help at all. Also sleep with a pillow between my knees which helps a little. If you care to google 'nocturnal back pain' you'll see that no one knows the reason for it.
Not knocking or getting snotty, honda.
So, if no one knows what causes it, there's a chance that something as simple as a new mattress could alleviate some cases.
Sorry if my post reads as being abrupt as isn't meant to be.