Here's why you might feel sleepy after drinking coffee

While coffee usually makes people feel more alert, some people may feel drowsy.

Feeling sleepy after coffee may be due to caffeine tolerance. Regular coffee drinkers may need more caffeine to stay alert, as their bodies may increase adenosine levels or receptors over time.

Research shows that genetics may make some individuals naturally more tolerant to the effects of caffeine.

If you have developed a tolerance, you may feel more sleepy during the day despite drinking coffee, making it seem like the coffee is causing you to feel tired.

The rate of caffeine metabolism varies for everyone. Typically, 99% is absorbed within 45 minutes, reaching peak levels in 1 to 2 hours. It takes 2.5 to 5 hours for your body to reduce caffeine by half.

If you metabolize caffeine quickly, you may become sleepy again in a relatively short period of time after drinking coffee. /CNA

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