Koffein-Halbwertsrechner
Sehen Sie, wie viel Koffein noch in Ihrem System ist, wenn Sie ins Bett gehen, basierend darauf, wann Sie es konsumiert haben. Finden Sie Ihre letzte sichere Zeit für Kaffee.
--
total mg today
--
mg at bedtime
Last safe caffeine time
--
to have less than 25 mg at bedtime
Häufige Fragen
What is the half-life of caffeine?
Caffeine has an average half-life of about 5 hours in healthy adults. That means if you drink 200 mg of caffeine, roughly 100 mg will still be in your system 5 hours later. Individual variation is significant — genetics, liver health, and medications can make it range from 3 to 7 hours.
How late is too late for coffee?
As a general rule, stop caffeine at least 8 to 10 hours before bedtime. If you go to bed at 10 PM, your last coffee should be around noon to 2 PM. Even small amounts of caffeine at bedtime (50 mg or more) can reduce sleep quality and delay sleep onset.
Does caffeine tolerance reduce the sleep impact?
Regular caffeine users do develop some tolerance to its stimulating effects, but research shows it still disrupts sleep architecture — particularly deep sleep — even if you feel like you fall asleep fine. The half-life doesn't change with tolerance.
How much caffeine is in decaf coffee?
Decaf coffee typically contains 2 to 15 mg of caffeine per cup, compared to 95 mg in regular coffee. It's not truly caffeine-free, but the amount is small enough that it rarely affects sleep for most people.