Why do my arm muscles and arm sockets ache? The pain is mostly in my upper arms. The aching seems less during the day. It is worse at night. I lose 80% of my arm strength while sleeping. I can barely pull my covers up if I wake up at night. I barely have any strength when I first wake up but it gets better soon after. This just started at the end of November. I didn't have this problem at all as I was doing a basement renovation late summer early fall. I had no problem tearing down drywall and ripping up floors. I don't think the two have anything to do with each other because I wasn't feeling any pain while renovating for 3 months. The pain started well over a month after finishing the construction work. I am a 51 year old female. I have been taking naproxen sodium for possible inflamation during the day and night but stopped a few weeks ago because it didn't seem to help.