Brain waste leaves from the glymphatic technique. Cleaning from the glymphatic process occurs when you are sleeping. Facet sleeping can cause or exacerbate shoulder and neck pain, and add to muscle imbalance. As a result, side sleepers have to concentrate on their neck and shoulder alignment to prevent waking up https://www.theorthopaedicandpainpractice.com/the-best-sleeping-positions-to-relieve-neck-pain/