Struggling to stay focused during the day? You’re not alone. According to Dr. Andrew Huberman, most people only get 3–4 hours of true deep work each day—and that’s not a problem if you learn how to use them wisely.
In this post, we’re exploring how to create a powerful 90-minute work block that’s backed by your brain’s natural rhythms. These are tools you can start using tomorrow—no biohacking gadgets or expensive productivity systems required.
Why 90 Minutes?
Your brain runs on ultradian rhythms—cycles of high and low alertness that repeat roughly every 90 minutes. These natural waves influence your:
- Focus
- Cognitive output
- Physical energy
Trying to push through beyond this window without rest often leads to burnout, scattered thinking, and wasted effort. But if you align your work with these cycles, you can maximize your flow state.
Huberman Tip: “I set a timer for 90 minutes and try to get a strong bout of work done. Not every minute will feel perfect—but when I get into that tunnel, it’s deeply satisfying.”
How to Time Your 90-Minute Block
Dr. Huberman recommends starting your work session 4–6 hours after your temperature minimum—a core biological low point that usually occurs about 2 hours before your typical wake-up time.
For example:
- If you wake up at 7:00 a.m., your temperature minimum is likely around 5:00 a.m.
- Your ideal work block? Around 9:00 to 11:00 a.m.
This window matches your body’s rising core temperature, elevated cortisol, and peak mental performance.
Build Your Tunnel of Focus: Step-by-Step
To create a tunnel of deep focus, Huberman recommends optimizing the physical and sensory elements of your workspace.
✅ Step 1: Eye-Level Screen Position
- Looking slightly upward at your screen boosts alertness.
- Looking downward can reduce energy and promote drowsiness.
“Where your eyes go, your brain follows. Looking slightly up can signal your brain to stay alert.”
✅ Step 2: Remove All Distractions
- Turn your phone completely off, not just silent.
- Close tabs, mute notifications, and use full-screen mode.
✅ Step 3: Add Low-Level White Noise
- Use a white noise app, fan, or audio track with unstructured, neutral sound.
- This helps your brain block out distractions and maintain cognitive flow.
✅ Step 4: Set a 90-Minute Timer
- Don’t expect perfect focus for all 90 minutes.
- Your goal is to protect the block, not perform perfectly.
Subscribe
Bonus Tip: Stack Motivation with Dopamine
When you finish a focused block of work, your brain releases dopamine, a reward chemical that reinforces effort and motivates you to repeat the behavior.
This is why Huberman calls his 90-minute sessions “deeply satisfying.”
The neurological reward makes deep work feel not only productive, but addictive (in the best way).
“It’s like a workout for the mind… you start to get addicted to it.”
Family Tip: Teach Kids the Power of Focused Time
Children and teens can also benefit from shorter focus sprints—even just 25–45 minutes. Model deep work yourself, and invite them to try a “focus challenge” with no distractions and a reward at the end.
You’re not just helping them with homework—you’re teaching a lifelong skill.
✅ The Neuroscience Work Block Cheat Sheet
Here’s how to structure your own 90-minute tunnel of focus:
- Schedule your work block 4–6 hours after your wake-up time
- Set up your space: eye-level screen, no phone, white noise
- Use a 90-minute timer and protect that time fiercely
- Expect some dips—ride the wave and stay in the tunnel
- Celebrate the finish—dopamine will do the rest
Leave a Reply