Starting today I am beginning an experiment to not drink coffee, even decaf. I came to this conclusion after drinking a single cup of regular Monday and sleeping poorly for the next 3 nights. A discussion on OEvolve brought up other potential improvements to inconveniences I have. As was pointed out, coffee is more than just caffiene, so the other stuff in my decaf might be problematic. Also, decaf isn't totally caffiene free.
Another side benefit is that it will force me to give up the last, lone staple dairy in my diet. I drink a small amount of milk in my daily dry cappucinnos.
I hate to give up coffee since I enjoy it so much, but sleep and other improvements are definitely worth giving it a try. It should be fairly easy as I am not addicted.