Hi There Over The Last 3 Week Period I Have

Hi there
Over the last 3 week period i have been waking up every morning with very stiff pain from my shoulders down to my fingers. The pain is also occurring in my knees. It is a sharp consistent pain. Mostly worse in the morning and gets better throughout the day but comes back again before bed. Any suggestions on what this could be? I have tried to sleep on my back to avoid applying pressure to my arms and legs but it does not seem to be helping.