With the exception of people with ADHD who respond differently to stimulants, caffeine—or any of the methylxanthines—will interfere with the quality of sleep even for those who can go straight to sleep immediately after drinking a cup of coffee.
The only 3 sources I have found in the medical/wellness field who discuss caffeine without selling it on the side suggest that caffeine should be used in a way that differs considerably from our cultural habit.
These are Dr Ari Whitten of
www.theenergyblueprint.com who features numerous cutting edge podcasts with a variety of doctors from a rigorously empirical, well researched, and well documented point of view.
Dr Amen who has rehabilitated NFL athletes who have suffered major traumatic brain injuries.
And Wade Lightheart of Bio Optimizers.
A basic summary is that drinking coffee daily causes problems that cancel out the health benefits. Dr Amen says it’s hard on the kidneys and restricts blood flow to the brain. They make differing suggestions about how to optimize the benefits of the methylxanthines, but I will just share the basics here.
Take three days of total abstinence per week and stop taking any of these substances 8 hours before going to bed. Those two suggestions are the most important. For even better results, delay the first dose until three hours after awakening at which time the body has a drop in cortisol heading to the mid day slump. Also, use a variety of plants with this family of compounds such as coffee, tea, cacao, Yerba maté, guarana, and kola nut, to name a few. Variety is highly advisable.
On a personal note, please select fair trade, shade grown, organic varieties to show gratitude to the people who work hard to provide for us and for the sake of the soil and the water as well as the community of living things that coexist with the plants and help to make it all possible.