Guide · sleep · 3 min read
When to drink coffee so it does not ruin your sleep — the long answer, briefly, when you are somewhere unfamiliar
Caffeine has a long tail. The cup at 3pm is still in your system at 9pm, whether you feel it or not.
Start here
Six things, in the order that makes the most difference. The first two do most of the work.
It travels well. Hotels, spare rooms, other people’s sofas.
If you only do one thing from this page, do the first point below. It is first because it removes the most friction for the least effort.
What helps
A reasonable cut-off for most people is early afternoon. If you are sensitive, make it noon.
Do not judge by whether you feel wired. Habitual drinkers stop feeling the effect long before it stops affecting sleep.
Caffeine peaks in your blood about thirty to sixty minutes after drinking, and takes roughly five to six hours to halve.
What to do when it does not work
Watch for the sources that are easy to forget: tea, cola, energy drinks, chocolate, some painkillers.
Drink your last coffee before you feel tired. Using it as a rescue at 4pm is what pushes the problem into the night.
If you are cutting down, do it gradually. Going from four cups to none produces a headache that people mistake for proof they need caffeine.
Questions people ask
Does decaf work?
Decaf still contains a small amount, but it is usually low enough not to matter. It also keeps the ritual, which is half of the habit.
Written for people who want the practical version. No accounts, no tracking, no newsletter wall.
If this is not the angle you need, try Using your body to come down after something stressful — the long answer, briefly, when you are not in the mood, When the inner voice will not let something go — a short read, when you are waiting for something or How to get through the first hour without your phone, in the order that helps, when you are doing this for the first time.