Hi Deb,
I am a podiatrist. And I do the same thing with my left foot. I also notice it when I am driving in my car sometimes. It is not a problem unless you are having pain or your foot is going numb. This is a neurovascular issue and you need to wiggle your toes when you think of it. Also, I get relief by clipping out of my left pedal when I am at a red light or when I stop. The other thing that could be going on is that your socks are too thick or your shoe is too small. You may be getting some swelling in the foot....especially if you ride in the afternoon or evenings. Anyway, let me know if you get any relief. Take care and good luck !!
Anna