Staff, Courtesy of Hullo While sleep may seem like the least of your worries when it comes to training, getting a good night's sleep is integral to improving your running, health, and general well-being. And while it is recommended to sleep on our backs, some of us are well ingrained in our side sleeping rituals. If you do decide to sleep on your side, one of the best ways to do it healthily is by investing in a pillow that is designed specifically for side sleepers. These pillows will help keep you comfortable, supported, and properly aligned. Whether you prefer a soft fiber or an overstuffed memory foam, there is sure to be an option for you. Check out some of our favorite picks below, and a guide on how to find the best pillow for your needs.