30 days

Cut evening caffeine in 30 days

one cutoff shift a week, plus a replacement drink

Caffeine's half-life is roughly five to six hours, which means a 6pm espresso still has half its caffeine in you at midnight and a quarter of it at 5am. You can absolutely fall asleep on that. What you lose is the deep sleep, which is why you can sleep eight hours after an evening coffee and still wake up feeling like you didn't.

The reason people fail at this isn't the caffeine — it's the ritual. The 4pm coffee is a break, a walk, a reason to stand up, a thing to hold. Take away the drink and leave the ritual homeless, and you'll be back on it inside a week. This plan replaces the ritual first and the caffeine second.

The protocol

  1. Days 1–5

    Count what's actually in you

    • Log every caffeinated thing and the time. Include tea, cola, dark chocolate, and pre-workout — they all count.
    • Rough guide: filter coffee 95mg, espresso 65mg, black tea 45mg, green tea 30mg, cola 35mg. Add up what lands after 2pm.
    • Note what each late one is for. Tiredness, boredom, a break from a screen, and cold hands are four different problems with four different fixes.
  2. Days 6–12

    Cutoff at 6pm, ritual intact

    • Nothing caffeinated after 6pm. That's the only rule this week.
    • Keep the 4pm coffee exactly as it is. You're moving the tail, not the habit.
    • Replace the post-6pm drink with something you actually want to hold: mint tea, sparkling water with lemon, decaf. A drink you tolerate won't survive a bad evening.
  3. Days 13–19

    Cutoff at 4pm

    • Move the cutoff to 4pm. At a 5–6 hour half-life, a 4pm coffee is around a quarter of its dose by 11pm — small enough to stop being the reason you're staring at the ceiling.
    • Keep the break, drop the caffeine. Take the walk, make the tea, stand by the window. The ritual is the point.
    • Expect a mid-afternoon dip around day 15. It's real, it's temporary, and a ten-minute walk moves it more than a coffee would.
  4. Days 20–26

    Cutoff at 2pm, taper the total

    • Cutoff moves to 2pm. If you get a dull headache in the first two days, you cut too fast — go back to 3pm for three days, then try again.
    • Half-caff the last cup of the day rather than deleting it. A taper avoids the withdrawal that makes people quit quitting.
    • Front-load instead: if you want three coffees, have them at 9am, 11am, and 1pm rather than spread through the day.
  5. Days 27–30

    Make the cutoff automatic

    • Hold the 2pm cutoff. Don't push it earlier because it's going well — a cutoff you keep beats a cutoff you admire.
    • Put the decaf where the caffeinated tin used to be. Most late coffees are made by hand before they're chosen by brain.
    • Agree your exception in advance: a late film, a long drive, a deadline. One planned exception a fortnight doesn't break this.

How you'll know it's working

  • You fall asleep faster — the gap between lights out and gone shrinks noticeably.
  • Your first morning coffee starts doing something again.
  • The 3pm dip arrives, passes in twenty minutes, and stops running your afternoon.

When you miss a day

A 7pm coffee at a friend's house costs you one night of shallower sleep and nothing else — the cutoff is still there tomorrow, and you don't restart the taper. Mosey keeps the current step rather than punishing the slip, because the habit is built out of most days, not all of them.

How Mosey helps

You don't have to hold the plan in your head.

Reading a protocol is the easy part. Mosey turns this one into scheduled days, adjusts it when your week falls apart, and keeps the streak alive while it does.

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Questions

How long does caffeine really stay in you?

The half-life is about five to six hours for most adults, so half of a 2pm coffee is still present around 8pm and a quarter around 1am. Genetics move that range a lot — some people clear it in three hours, some take nine. If coffee has never affected your sleep, you're probably a fast metaboliser, and you can be more relaxed about the cutoff.

Is decaf actually caffeine-free?

Nearly. A decaf coffee has roughly 2–5mg against 95mg for a normal one. It's irrelevant to your sleep and it keeps the ritual, which is exactly what you want.

I get headaches when I cut back. What am I doing wrong?

Cutting too fast. Withdrawal headaches usually mean a drop of more than about 100mg a day. Reduce by roughly a half-cup at a time, hold it for three days, then reduce again.

What about green tea in the evening?

It's less, not nothing — around 30mg a cup. If you're sensitive, two evening cups is most of an espresso. Try herbal for two weeks and see whether it changes anything for you.

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