I Am A 52 Year Old Woman. For The Past

I am a 52 year old woman. For the past few months, I have been dealing with achy pain, mostly in my limbs....arms, legs. Sometimes shoulders, hips, as well. It is most often an issue when I'm inactive...at the end of a long day or, especially, at bedtime. I have difficulty sleeping due to the pain. Any ideas what could be going on?