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 