How long does caffeine stay in your body after drinking 1 cup of coffee at night?

Caffeine has an average half-life of about five hours, meaning it takes about five hours for your body to eliminate half of the caffeine you've consumed. Some people may metabolize caffeine more quickly or more slowly than this average, depending on their genetics, age, and other factors.

If you drink one cup of coffee at night, you may still have about half of the caffeine in your system five hours later, which can interfere with sleep for some people. However, some people find that caffeine does not affect their sleep, even if they drink it close to bedtime.

If you find that caffeine is affecting your sleep, it is best to avoid consuming it in the hours leading up to bedtime. You may also want to limit your overall intake of caffeine, especially if you are sensitive to its effects.