How Caffeine Works in the Body
Caffeine exerts its stimulating effects by blocking adenosine receptors in the brain, which normally signal drowsiness. Its metabolic half-life is approximately five hours, meaning it takes that long for half the caffeine in your system to be processed. Sleep specialists note that for restful sleep, caffeine levels in the body should drop to around 50 milligrams. A single cup of coffee typically contains 150 to 200 milligrams of caffeine, so a late-afternoon brew can linger in your system, interfering with sleep well into the night. Speeding up caffeine metabolism and excretion is key to reclaiming restful slumber.
Strategies to Clear Caffeine from Your System
Diet also plays a role. Protein-rich foods like milk, nuts, and legumes can stabilize digestion and support liver function, aiding the body in processing caffeine. Cruciferous vegetables like broccoli or kale may support liver enzyme activity, helping the body metabolize caffeine more efficiently.
To promote sleep when caffeine lingers, incorporate foods rich in sleep-inducing nutrients. Cherries and walnuts contain small amounts of melatonin, a hormone that regulates sleep. Bananas and milk provide tryptophan and magnesium, which calm the nervous system and relax muscles to foster deeper sleep. Leafy greens like spinach and lettuce, packed with calcium and sleep-supporting compounds, make excellent additions to an evening meal.

When to Seek Help
In cases of excessive caffeine intake, rest and hydration are the safest first steps. However, if you experience symptoms like heart palpitations or severe anxiety, consulting a healthcare professional is advisable. Experts recommend avoiding caffeine at least six to eight hours before bedtime. For those particularly sensitive to its effects, steering clear of coffee after 2 or 3 p.m. is a wise precaution.
By adopting these evidence-based strategies, you can counteract caffeine’s lingering effects and improve your chances of restorative sleep, even after a day of excessive coffee consumption.
Haeun Oh, HEALTH IN NEWS TEAM
press@hinews.co.kr