I woke with pain in left side ribs and back left arm went numb for about a minute ?

Could be neck : You may possess acquired cervical spondylosis, and sleep position caused a transient nerve compression and referred pain. Alternatively, might wonder if you have some tendency to experience brachial plexus compression such as thoracic outlet syndrome. Carpal tunnel at wrist can refer pain to shoulder. If this repeats might get your doc to check out.