When laying on my back for a long period of time my right hand and forearm go completely numb every time is this normal? should i be worried

Perhaps: If this is entirely positional, it may be related to a musculoskeletal cause such as arthritis of the neck. While this is often treated conservatively by nsaids and physical therapy, you should first see your doctor for a full evaluation and physical exam.

No, not normal.: No these symptoms are not normal, but with appropriate evaluation, this condition can likely be properly diagnosed and treated effectively. Contact your doctor to discuss these symptoms and allow him/her to examine you and obtain necessary testing. Once he/she has a reasonable impression, he/she will organize a treatment plan for you.