Hi con339,
Sorry I'm late to your post! I want to welcome you to the MH PM (Pain Management) Forum. I'm glad that you found us and posted. There are no Doctor's on the PM Forum, we are all CP (Chronic Pain) patients that help each other through our own experiences with pain issues.
I'm very sorry that you are having painful issues with your arms. What Ghilly and Ginger1975 said are both good suggestions as to what might possibly be the cause of what you are experiencing. The only way that you will be able to find out what is causing this, is for you to go to your Dr. and receive a diagnosis. We can't diagnosis anyone's condition or even suggest a remedy. We try to give you possibilities that might be causing the condition and let people know what has worked for us in the past or is working now. But, it will take a visit to the Dr. to get a diagnosis or a remedy for you. Remember what I said at the beginning, there are no Dr.'s on the PM Forum.
If you would like to "Ask a Doctor" here on MH, we do have a Dr.'s Forum and I'll give you the link to that. Click on this and it will give you all the different Forums that MH has to offer. If you look to the right you will notice the "Ask a Doctor Forums" and all the different Dr.'s that you can chat with on MH.
Here's the Link:
http://www.medhelp.org/forums/list
Hopefully, you will be able to take care of the pain that you are experiencing at night and get back to normal. I wish you the best and hope this has been of help to you.
Good luck..........Sherry