All of a sudden last week or so, i see myself dosing off in mid afternoon like a 90yr old man..i'm 50, run 6 day's a week, in tip top shape..what???

Often times, normal: If you are not getting restful sleep at night, you may be experiencing sleepiness during the day. Often times, this is the body telling you it needs more rest. If a nap in the afternoon is the only symptom (i.e. not associated with weight changes, hair loss, nail changes, etc.), then rest well for few days and see how you feel.