It has been about 3 months since I have gone caffeine free and I so glad I have made this change. I have more energy that I had before. I do not have the crashes where I am tired late in the day and need a pick me up. I am sleeping better. My mood has improved. I am able to function with less sleep. The best thing is that my running did not suffer.
If you need your caffeine to help you wake up each morning, I suggest for you to quit it completely. It will take about 3 weeks with the first week being a pain for you to be off of caffeine. Once you realize that you do not need the caffeine pick up to function, your days will be much better.
Who else has given up caffeine?