Many people rely on coffee, tea, or soda to stay alert during the day. Caffeine is a natural stimulant that works by blocking adenosine, a chemical in your brain that signals when it’s time to rest. This blocking effect delays your brain’s sleep drive and can cause you to stay awake longer than intended²

The problem? Caffeine doesn’t leave your body quickly. Its duration depends on its half-life, the time it takes for your body to eliminate half of what you consumed. On average, caffeine’s half-life is about 5 hours^1,2.

For example:

• If you drink a coffee containing 200 mg of caffeine at 2 PM, you’ll still have about 100 mg in your system at 7 PM, and around 50 mg by midnight.

That lingering caffeine keeps your brain alert, making it harder to fall asleep and reducing sleep quality once you do. A controlled sleep study found that consuming caffeine even 6 hours before bedtime significantly disrupts sleep patterns and reduces total sleep time³.

Tip: To protect your sleep, try to avoid caffeine after 2 PM. If you’re particularly sensitive, even earlier might be better. Opt for caffeine-free alternatives like herbal tea or decaf coffee in the afternoon and evening.

Over time, reducing late-day caffeine can improve how quickly you fall asleep and how deeply you rest^3,4

Your body, and your sleep, will thank you.