When’s the Best Time to Drink Coffee? Here’s What the Research Says

But is there actually a “best” time to drink it?

The answer isn’t quite as simple as a specific hour on the clock. Research on caffeine suggests that when you drink coffee matters most in relation to when you go to sleep. The later the caffeine is consumed, particularly in larger amounts, the greater the potential for it to interfere with nighttime sleep.

Morning Is a Simple Starting Point

Caffeine’s effects can persist for hours, and its elimination varies considerably between individuals. Research has estimated caffeine’s typical half-life at roughly three to six hours, although it can be longer or shorter depending on the person and other factors.

That’s one reason a morning cup is unlikely to disrupt nighttime sleep as much as a large coffee late in the afternoon or evening.

But Don’t Assume Afternoon Coffee Is Always a Problem

A recent randomized crossover trial examined caffeine doses consumed at different points before bedtime. Researchers found that a 100-milligram dose did not significantly affect sleep in the study, while a much larger 400-milligram dose had measurable effects when consumed closer to bedtime.

A single ordinary cup of coffee isn’t necessarily equivalent to several strong coffees consumed together. Caffeine content can vary substantially by coffee type, serving size, and preparation.

The Biggest Consideration Is Your Bedtime

A systematic review and meta-analysis of 24 studies estimated that a standard serving of coffee containing about 107 milligrams of caffeine should be consumed at least 8.8 hours before bedtime to avoid a measurable reduction in total sleep time.

Another controlled study found that 400 milligrams of caffeine could disrupt sleep even when consumed six hours before bedtime.

What About the Famous “Wait Until Your Cortisol Drops” Advice?

You may have heard that you should wait until later in the morning because cortisol, a hormone involved in the body’s stress response and daily rhythm, is naturally higher after waking.

But that shouldn’t be presented as a universal scientific rule.

Stronger evidence on coffee timing focuses on caffeine’s relationship with sleep, not on waiting a specific number of minutes after waking.

Your Last Cup May Matter More Than Your First

When should I stop drinking it?

If you regularly drink coffee late in the day and have trouble falling asleep, moving your final caffeinated drink earlier is a straightforward experiment.

Research has repeatedly found that caffeine consumed close to bedtime can interfere with sleep. In one controlled study, 400 milligrams of caffeine affected sleep even when taken six hours before bedtime.

A separate systematic review found that caffeine consumption was associated with reduced total sleep time and other changes in sleep measures, with the effect influenced by both dose and timing.

A Practical Coffee Schedule

There’s no need to turn your morning coffee into a complicated calculation.

Late morning: Still reasonable for many people, especially if you don’t usually go to bed early.

Early afternoon: Individual tolerance matters more. If coffee at this time doesn’t affect your sleep, you may tolerate it well.

Late afternoon and evening: This is where greater caution makes sense, particularly with larger servings or multiple cups.

There’s No Need to Overcomplicate Your Coffee Routine

Coffee is supposed to be enjoyable, not another thing to worry about.

If your morning cup works well for you, there’s little reason to obsess over finding a supposedly perfect minute to drink it.

Instead, focus on when caffeine could interfere with your sleep.

The research points to a simple principle: earlier is generally easier on your sleep schedule than later, especially when caffeine intake is high.