When to Stop Drinking Coffee
About 8–9 hours before your bedtime. You can fall asleep fine after an afternoon coffee and still get worse sleep. Caffeine lingers far longer than most people think. Here is your personal cutoff.
Your time
2:00 PM
Past this point caffeine is still in your system at bedtime and quietly steals your deep sleep — even if you fall asleep fine.
The science
Caffeine has a half-life of roughly 6 hours — so a 2pm coffee can still be at quarter-strength near midnight. Even if you fall asleep, it suppresses the deep, slow-wave sleep that does your real physical recovery.
A practical rule is to take your last coffee about 8–9 hours before your target bedtime. The tool calculates this precisely from your wake time.
Frequently asked questions
Can caffeine affect sleep even if I fall asleep fine?
Yes. Caffeine reduces the amount of deep slow-wave sleep you get, so you can sleep a full night and still wake unrefreshed. Falling asleep and sleeping well are different things.
Does it matter what time I wake up?
Yes — your cutoff is tied to your bedtime, which is tied to your wake time. An early riser and a night owl have very different last-coffee times.
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