Are lumbar pillows good for supporting the back while sleeping?

can they help improve posture if you sleep on your back, and also help improve breathing? Thanks.

Whenever I release my wives back muscles I notice a big difference in her breathing when I go to bed, it's much more restful and even quieter. I've had to check it a few times because I couldn't hear her as I usually can. Here's what I do to help release those muscles:
Back:
(do from a sitting position)
Place your left hand on your left leg next to your body. Place your right hand over your left shoulder, fingers over the back and the palm in the front and firmly press on them and hold. After 30 seconds slowly lower your body forward and to the outside of your left leg, keeping your left arm fairly straight as you do. When you reach your lap remain there for another 10 seconds, release the pressure but rest there for another 30 seconds. Then reverse your hand positions and do your right side.
For best results relax your body first by taking a deep breath and exhaling then remain this relaxed.

Far Infrared (FIR) Lumbar Cushion

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