RiseDare Caffeine cut-off calculator
Caffeine stays in your body far longer than it feels like it does. Enter your bedtime to see when your last cup should be.
Why an afternoon chai can cost you the morning
Hours after a cup, a good part of the caffeine is still in your blood, even when you no longer feel a lift.
Caffeine blocks the signal that tells you that you are sleepy. The tiredness is still there when it wears off.
Falling asleep later or sleeping lightly makes the next alarm harder, which makes the next coffee stronger.
Questions people ask
A common rule is at least six hours before bed, and eight if you are sensitive to caffeine. It stays in the body for hours: the amount roughly halves every five hours or so, and that varies a lot between people.
Tea has less caffeine than coffee, but it still has some, and so do cola, energy drinks and dark chocolate. If you sleep badly, count all of them.