Blog

Perhaps reaching for a cup of coffee is one of the first things you do each morning. It wakes you up, sharpens your focus, and gives that jolt to start the day. But according to Dr. Andrew Huberman, a Stanford neuroscientist, the timing of your coffee might be affecting your energy in unexpected ways.  At the heart of this phenomenon is a molecule called adenosine—a key player in your brain’s sleep-wake cycle.

What Is Adenosine?

Adenosine is a naturally occurring chemical in the brain that builds up over the course of the day as a byproduct of energy usage. As your body and brain burn through fuel (like glucose and ATP), adenosine levels gradually rise. This rising tide of adenosine binds to specific receptors in the brain, creating a growing sense of sleepiness. It’s your body’s way of saying, “Time to rest.”

By evening, if you’ve been awake for 14–16 hours, adenosine has built up enough to help you feel genuinely tired. Then during sleep, adenosine levels drop again.

How Caffeine Interferes with Adenosine

Caffeine doesn’t eliminate adenosine. Instead, it blocks the adenosine receptors in your brain. Think of it like putting a cap over a keyhole—adenosine is still floating around, but it can’t bind to its target. That’s why you feel more alert after drinking coffee—adenosine can’t send its “sleepy” signals.

However, the body continues to produce adenosine even when the receptors are blocked. Once the caffeine wears off (usually within 4–6 hours), all the adenosine that’s been “waiting at the door” can flood the system—leading to the notorious caffeine crash many people feel mid- to late-morning or early afternoon.

Huberman’s Take: Delay Your First Cup

Dr. Huberman suggests a simple tweak: wait 90–120 minutes after waking before drinking coffee.

Why? Because when you first wake up, your body is still clearing out residual adenosine from the night before. If you consume caffeine too early, you’re preventing that final bit of adenosine from clearing naturally. Then, once the caffeine wears off, you may experience a sudden and overwhelming wave of sleepiness.

By delaying your first cup, you give your body time to naturally lower adenosine levels and stabilize your wakefulness using its own internal chemistry—namely cortisol and sunlight exposure (which helps set your circadian rhythm). When you do have coffee later in the morning, it’s less likely to cause a crash and may provide a more sustainable boost.

Key Takeaways

• Adenosine builds up throughout the day and makes you feel tired.
• Caffeine blocks adenosine receptors, but doesn’t remove adenosine itself.
• Once caffeine wears off, adenosine floods in, potentially causing an energy crash.
• Waiting 90–120 minutes after waking to drink coffee may help you avoid the crash and enhance your overall alertness.

Try This

Next time you wake up, hold off on your coffee for 90 minutes. Start your day with some water, natural light, and a few deep breaths outside. Then enjoy your coffee once your body has had a chance to stabilize its chemistry. You might find that your energy stays steadier—and your mind clearer—throughout the day

Resources Page: Downloads, Guides, Food Lists & Worksheets.

Have a personal interest? Contact me to explore personal interests by clicking the link. Schedule a Callback

Disclaimer: The “Just Suppose Blog” shares ideas in exploring personal progress as derived from various sources.  It is intended as information only and is not intended as advice to engage in any specific physical or mental activity.  Always consider whether these ideas, concepts, techniques & activities are right for you & always confer with your health professionals.