@jack.bear65: You're not "weak in the back." You just don't release it before sleep. For many people, lower back pain worsens at night - not because of the mattress, but because the lumbar spine doesn't return to neutral when lying down. Knees-to-chest passively shortens the hip flexors, opening the posterior lumbar space and reducing intradiscal pressure. The gentle rock allows the psoas and quadratus lumborum to complete a tension reset between each release and return. This move is simple. What's not simple is letting your spine enter sleep in a released position. Do your hips or your back touch the bed first when you lie down? Drop HIPS or BACK. * Save - not to stretch. To reset. Come on, let your spine rest in neutral. #lumbarspine #backpain #sleep #neutralalignment #physicaltherapy #fyp