Should You Wait 90 Minutes Before Your Morning Coffee?

Few pieces of coffee advice have spread as fast as this one: don’t drink coffee as soon as you wake up; wait 90 to 120 minutes. Supporters say it prevents an afternoon crash and works with your body’s natural cortisol rhythm. So, should you wait 90 minutes before your morning coffee? Based on current evidence, there is no need to, though there is no harm in it either. The idea has never been directly tested, and a 2024 scientific review found no support for it. What matters more is your total intake, your sleep and how late in the day you drink caffeine.

Here is where the idea came from, what the biology actually says, and how to find the timing that works for you.

Key takeaways

• The 90-minute rule was popularized by neuroscientist Andrew Huberman on podcasts and social media from around 2022.
• Its two arguments involve adenosine (sleep pressure) and cortisol (a hormone that rises after waking).
• A 2024 review in the Journal of the International Society of Sports Nutrition concluded that evidence for delaying caffeine to prevent an afternoon crash is lacking.
• Late-day caffeine, short sleep and large doses are better-supported reasons for poor energy and sleep.
• If waiting makes you feel better, keep doing it. If it makes your morning miserable, you can skip it.

In this article

1. Where the 90-minute rule came from
2. Should you wait 90 minutes before your morning coffee? The evidence
3. Claim by claim
4. What matters more than morning timing
5. Try a two-week test
6. FAQ

Where the 90-minute rule came from

The advice is usually traced to Stanford neuroscientist Andrew Huberman, who has recommended delaying caffeine for 90 to 120 minutes after waking. His reasoning, as widely reported, goes like this: during sleep your brain clears adenosine, a molecule that builds up while you are awake and creates sleep pressure. If you drink coffee right away, caffeine blocks adenosine receptors before the remaining adenosine has cleared, and when the caffeine wears off, the leftover adenosine hits you as an afternoon slump.

A second argument, popular on social media, focuses on cortisol. Cortisol naturally rises in the first 30 to 45 minutes after waking, a pattern called the cortisol awakening response. The claim is that adding caffeine during that peak is wasteful or stressful and that waiting lets you “stack” the two effects.

Should you wait 90 minutes before your morning coffee? The evidence

No direct trials

The most important point is simple: no study has tested whether people who delay their first coffee by 90 minutes have fewer afternoon crashes or better energy than people who drink it right away. The rule is a hypothesis built from pieces of physiology, not a tested result.

The 2024 review

In 2024, Jose Antonio and colleagues published a review of common caffeine questions in the Journal of the International Society of Sports Nutrition. On this topic, they concluded that the scientific basis for delaying caffeine to avoid an afternoon crash is lacking. They noted that caffeine is particularly effective at improving alertness after short or restricted sleep, which is exactly when people reach for it first thing in the morning.

Adenosine: partly right, but incomplete

It is true that caffeine works by blocking adenosine receptors, as explained in why coffee can make you tired. It is also true that when caffeine wears off, the sleep pressure you have built up is still there. But that is true whenever you drink coffee, not only in the first 90 minutes. Delaying your first cup simply shifts when the caffeine wears off; it does not eliminate the adenosine you have accumulated during the day.

Cortisol: weaker than it sounds

Caffeine can raise cortisol, particularly in people who rarely drink it. Habitual coffee drinkers show a smaller cortisol response because of tolerance, which the 2024 review highlighted. For most regular drinkers, the cortisol argument for waiting carries little weight, and there is no evidence that coffee during the morning cortisol rise causes harm in healthy adults.

Claim by claim

What matters more than morning timing

• Your last cup, not your first. Caffeine’s effects can last many hours, and drinking it in the afternoon or evening can reduce sleep quality. Our guide to caffeine and sleep explains why, and the caffeine half-life calculator helps you plan a cut-off time.
• Sleep itself. An afternoon slump is often a sign of short or poor sleep, plus the normal early-afternoon dip in alertness.
• Total intake. The FDA and EFSA consider up to 400 mg a day generally safe for most healthy adults, with single doses up to 200 mg (EFSA). Pregnant or breastfeeding people are advised to stay under 200 mg a day, and caffeine is discouraged for children and teens.
• Food and stomach comfort. Some people feel jittery or get heartburn when they drink coffee before eating. That is a good personal reason to have breakfast first, regardless of the 90-minute rule.

Try a two-week test

Because evidence is thin, your own experience is a fair guide. Here is a simple self-experiment:

1. Week 1: have your usual coffee within 30 minutes of waking.
2. Week 2: wait 90 minutes; drink water and eat breakfast first.
3. Keep everything else equal: same total cups, same last-cup time, similar bedtime.
4. Each day at 3 p.m., rate your energy and focus from 1 to 10, and each morning rate your sleep.
5. Compare the averages. If week 2 is clearly better, keep the habit. If not, enjoy your coffee when you want it.

Choosing your morning cup

If you want a gentler start or plan to drink more than one cup, our Half Caf blends regular coffee with water-process decaf for half the caffeine and a smooth medium roast. If you prefer a classic first cup whenever you have it, the Breakfast Blend is smooth and nutty, and for a lower-caffeine morning alternative, English Breakfast tea is a malty, robust blend of African and Indian black teas.

Morning coffee timing FAQ

Is it bad to drink coffee right after waking up?

Current evidence does not show that it is harmful for healthy adults. If it upsets your stomach or makes you jittery, try having it with or after breakfast.

Does delaying coffee prevent an afternoon crash?

That has not been shown in studies. Afternoon slumps are more closely linked to sleep, the natural circadian dip and large or late doses of caffeine.

What is the best time to drink coffee?

The best time is one that gives you the alertness you want without cutting into sleep. For many people, that means morning to early afternoon.

Does coffee raise cortisol?

It can, especially in people who don’t drink it regularly. Habitual drinkers develop partial tolerance to this effect.

Sources

1. Antonio J, et al. Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show? Journal of the International Society of Sports Nutrition, 2024.
2. The controversy over the wait-to-caffeinate rule, Sleepopolis, 2024.
3. Spilling the beans: how much caffeine is too much?, US FDA, accessed 2026.
4. Scientific opinion on the safety of caffeine, European Food Safety Authority, 2015.

Facts checked in October 2026.

This article is for general information only and is not medical advice. If you have a health condition, are pregnant or take medication, ask your doctor before changing your caffeine intake.

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