If you listen to the Huberman Lab podcast, you already know the two habits Huberman recommends most: get outside for morning daylight within 30-60 minutes of waking, and delay your first coffee by 90-120 minutes. (His evening advice is covered separately in how to follow the Huberman sleep protocol.)
Understanding the science is easy. Executing it consistently in the real world is where people fail. That's why we built ARC.
Why Huberman Says to Delay Caffeine#
When you wake up, some adenosine (the molecule behind sleep pressure) is still around. Caffeine blocks adenosine receptors; it doesn't remove the molecule. When a very early coffee fades in the afternoon, the sleepiness it was hiding can land all at once.
Huberman's argument is that waiting lets your natural cortisol rise do the waking up, so caffeine isn't masking leftover sleepiness. Research on the delay itself is limited: some people find it smooths their afternoon, others notice no difference. We look at the evidence in more detail in why delay your first coffee 90 minutes.
Why Morning Light Matters#
Morning light is the strongest signal your body clock gets. It supports your natural morning cortisol rise, which helps you feel awake, and it helps set when melatonin rises in the evening, roughly 12 to 14 hours later for most people. That's why a bright morning makes it easier to fall asleep at night. (The full picture is in the science of light and sleep.)
How much? About 20 minutes outside in the morning (longer under heavy cloud). A window cuts most of the useful light. Never look directly at the sun.
Check Your Sun Window: See how cloud cover changes the picture with our free Sunlight Window Calculator. ARC's in-app timer uses a steady 20 minutes.
Walk, Don't Just Stand#
If you can, turn your morning light into a walk. Andrew Huberman has suggested on his podcast that the optic flow of walking forward (the world streaming past you) may help calm the brain's threat response. The human evidence is thin, but a walk is an easy way to get your light anyway, and it gets you moving before the day starts. Keep your head up rather than on your phone, and wear sunglasses only if you need them to be comfortable.
How ARC Automates This For You#
Instead of trying to remember these timings, ARC builds them around your chronotype (take our free Chronotype Quiz to find yours), your wake time and your real sunrise:
- 1.The morning light timer: ARC works out your real sunrise from your iPhone's time zone (no location permission) and runs a 20-minute timer as a Live Activity, with an indoor fallback when it's still dark.
- 2.The coffee window: a notification tells you when your first coffee fits your morning.
- 3.Your day plan: the first item is "the one ask", the single thing worth doing today. Your last safe coffee and wind-down reminder are worked out from your bedtime.
Stop guessing your timings. Let ARC do the math so you can focus on executing.
Scientific References#
- Huberman, A. D. (2021). Master Your Sleep & Be More Alert When Awake. Huberman Lab Podcast, Episode 2.
- Zeitzer, J. M., et al. (2000). Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression. Journal of Physiology, 526(3), 695-702.