When to drink coffee so it does not ruin your sleep, step by step, when you are cold and want to be warm

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Most of the usual advice misses the point. What follows is the version that survives contact with a real week.

Get a blanket first. Being cold defeats the point.

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.

Caffeine peaks in your blood about thirty to sixty minutes after drinking, and takes roughly five to six hours to halve.

Watch for the sources that are easy to forget: tea, cola, energy drinks, chocolate, some painkillers.

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.

A reasonable cut-off for most people is early afternoon. If you are sensitive, make it noon.

Drink your last coffee before you feel tired. Using it as a rescue at 4pm is what pushes the problem into the night.

Do not judge by whether you feel wired. Habitual drinkers stop feeling the effect long before it stops affecting sleep.

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.

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