I have been experiencing numbness in my left arm and hand for about 6 months now. I notice that when I sleep on my stomach with my hands above my head then my left arm always goes numb and it becomes somewhat painful. Also, each day as i sit at my desk and type I notice the area around my tricep, beneath my tricep, and fingertips get prickly sensations all throughout the day which is annoying. Lastly, when I sit in my couch and lean forward to type on my laptop the tingling sensation becomes very intense. I recall I experienced this at my former job and made some changes to my desk, such as raising my chair, making my monitors higher, but these changes have not helped at this job. Any help or suggestions would be greatly appreciated.