When finding the best sleeping position for back pain, you must do some trial and error.
Odds are, the positions that cause sensitivity while you are awake will more than likely cause pain while you are asleep.
This means if twisting the low back while awake hurts, sleeping in a twisted position will create the same level of sensitivity, especially if you stay in that position for hours and hours.
So instead of finding the perfect position, experiment with getting into and keeping yourself in the ideal position to support a good spine position.
This is especially true when you are in the high-sensitivity phase of your recovery.
As you become less sensitive, your ability to sleep in different positions will increase, but that has to be earned.
Base your ideal sleeping positions around the positions that bring the least amount of sensitivity while you are awake.