Whether it’s back, side, or stomach, people tend to wake up in the position that their bodies naturally feel the comfiest in. Unless there’s a specific reason that a certain position is recommended for you, it’s probably best to keep doing what feels right. https://greatist.com/happiness/best-sleep-positions
Everyone has a propensity toward one position or another, but side sleepers are the most common. Although sleeping on one’s back is ideal, side sleeping is the next best thing but it’s not all is good. Side sleepers often suffer from frequent neck and back pain. This position has even been shown to cause more wrinkles.
Side sleeping may also lead to the constriction of the neck and the shoulder muscles and, thus, may lead to morning stiffness. Also the shoulders support most of the body weight and the pressure on the arms can lead to arm and hand pain and numbness. When people remain on their left side for a longer period of time, the heart and the lungs are forced to cope with some pressure. Alternating sides is one of the best possibilities for overcoming this. https://www.sleepridiculouslywell.com/pros-cons-side-sleeper/#tab-con-3