I am 63 years old, and in fairly good condition, and the beginning of arthritis in my shoulders and arms. I have been experiencing severe tiredness in the afternoons, and take several quick naps in the evenings. The severe tiredness is new and started about a month ago. I take a 50 + vit. and my most recent health screening (less a month ago) showed no concerns with all levels at or below normal numbers. Any ideas what may be causing the tiredness and how to correct? Thanks.