Side sleepers have specific needs regarding spine, hip, and shoulder alignment that must be met to provide comfort and support throughout the night. Therefore, it is recommended to use mattresses designed with side sleepers in mind to ensure the most restful sleep possible. Side sleepers have specific needs regarding spine, hip, and shoulder alignment that must be met to provide comfort and support throughout the night. Therefore, it is recommended to use mattresses designed with side sleepers in mind to ensure the most restful sleep possible.