Ryan says that for him, maximizing energy started with understanding a bit about how caffeine works. To the brain, caffeine molecules look a lot like a molecule called adenosine, whose job is to tell the brain to slow down and feel sleepy or groggy. Adenosine is helpful in the evening as you get ready for bed. But when adenosine makes us sleepy in the morning or afternoon, we usually reach for caffeine. When caffeine shows up, the brain says, “Hey good-lookin’!” and the caffeine binds to the receptors where the adenosine is supposed to go. The adenosine is left to just float around, and as a
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