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Coffee is the most widely consumed stimulant in the world — yet most people drink it at the wrong time of day, in the wrong quantity, and wonder why the afternoon crash still arrives on schedule.

The difference between coffee that works and coffee that leaves you jittery has far less to do with the beans than with timing. Understanding how caffeine interacts with your own hormonal rhythm turns a habit into a genuine tool.

When Should You Drink Coffee?

Cortisol — the hormone that naturally wakes you up — peaks between 8 and 9 in the morning. Drinking coffee during that window blunts its effect and builds tolerance faster, which is why a cup at 10am often feels noticeably stronger than the same cup at 7am.

Waiting roughly 90 minutes after waking lets that natural peak do its job first. Most people report the same alertness from less coffee once they make this single change.

• Wait 90 minutes after waking before your first cup
• Cap intake at 400mg of caffeine daily — about four cups
• Stop at least 8 hours before bed; caffeine has a 5–6 hour half-life
• Drink a glass of water alongside each cup to offset mild diuresis

Timing matters more than quantity for most coffee drinkers.

How Much Is Actually Too Much?

Health authorities converge on 400mg per day for healthy adults. Beyond that, the returns flatten and the side effects — elevated resting heart rate, disrupted deep sleep, afternoon anxiety — start to compound quietly over weeks.

Sensitivity varies widely and is largely genetic. If a single espresso after lunch keeps you awake at midnight, you are almost certainly a slow metaboliser, and the standard advice needs adjusting downward.