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Your Afternoon Coffee Might Be Why You're Still Tired. Here Are 10 Reasons, And What To Do Instead

Summary: You pour a coffee at three because you're flat, and by ten tomorrow you're flat again. You know the lying awake at eleven. You know the wall after lunch that comes back every day. You think the cup is fixing it. But a good part of a three o'clock coffee is still in your blood at bedtime, and in one sleep study caffeine six hours before bed took more than an hour off the night. Here are ten reasons the afternoon cup may be running you in a circle.

SelkieThe 3pm coffee
What it doesFour things at a real amount, every morningBlocks the tired signal for a few hours
At bedtimeNo caffeine, nothing to wear offA good part of the cup is still in your blood
TomorrowSame two droppers at the kettleStarts with less sleep, so you need it again
How oftenOnce, in the morningThree cups a day is now the average
TasteA little like the sea, gone in ten secondsWhatever is left in the office pot by three

TLDR: The morning coffee is fine. Keep it. This page is about the second and third cups, the ones you pour because you're flat. Selkie is four things, at real amounts, taken once at the kettle in the morning. Nothing to wear off by bedtime. And ninety days to make up your mind.

01Reason 1 of 10

3:00pm. You pour it because of the wall after lunch.

A woman in her fifties pouring coffee from a glass pot into a plain mug at an office kitchenette in the afternoon

Ask anyone why they make a coffee at three. It is never the taste.

It is the dip after lunch. The mug is the closest thing to hand, so the mug it is. You are not really after the coffee. You are after the dip stopping.

Caffeine works by blocking a signal in your brain. The signal is called adenosine, and it is how your body tells you it is tired. The coffee turns off that gauge for a few hours. The tiredness is still there. You just can't read it.

Source 1

02Reason 2 of 10

11:00pm. A good part of that cup is still in your blood.

A woman in her fifties lying awake in bed at night, an empty mug on the bedside table

You know the lying awake, not sure why.

It takes your body four to six hours to clear half the caffeine in a cup. Pour one at three and half of it is still working at eight. Some of it is still there at one in the morning. You feel tired, so you get into bed. Then you lie there.

In a sleep study in Detroit, people took caffeine six hours before bed. The recorder showed they lost more than an hour of sleep. They did not know it. They thought they had slept fine.

Source 2, 3

03Reason 3 of 10

7:00am. Tomorrow starts short.

A woman in her fifties sitting on the edge of an unmade bed in the early morning, rubbing her face

So you're flat by ten. So there's a cup at three. And round it goes.

Lose an hour of sleep and the next day starts short. The wall after lunch comes early. So the cup at three feels earned, and it is. It is also the reason tomorrow will look the same.

The loop is quiet. It does not feel like a loop. It feels like being a person who needs coffee. Take away the afternoon cup and the loop breaks with it. The morning one can stay.

Source 4

04Reason 4 of 10

Six months on, the same cup does less.

A woman in her fifties looking down into an empty mug in a kitchen, an almost empty coffee pot behind her

You used to feel it. Now you just feel wrong without it.

Your body gets used to caffeine. It grows more of the signal the coffee blocks, so the same cup lifts you less each month. You end up drinking it just to feel normal.

Researchers in Bristol tested regular coffee drinkers who had gone one night without. Then they gave them caffeine. It got them back to about where the non-coffee drinkers already were. It did not take them past it. The lift you feel from the cup is mostly the dip from not having had one yet.

Source 5, 6

05Reason 5 of 10

4:30pm. Wired and tired at the same time.

A woman in her fifties at a kitchen table with a laptop, hands wrapped tight around a mug, tense and tired

Heart going, head foggy, and no chance of a nap even if you could take one.

You know the feeling by half four. Busy hands, a heart that won't settle, and a head that will not hold the thing in front of it. The caffeine has your body up. The short night has your mind down. Both at once.

The FDA's own list of what too much caffeine does reads like a Tuesday afternoon: jitters, a fast heartbeat, an upset stomach, trouble sleeping. Cup three is where a lot of people cross that line without noticing.

Source 7

06Reason 6 of 10

Three cups a day. That's the average now.

Four plain white mugs in a row on a kitchen counter, each with a ring of dried coffee, beside a near-empty coffee pot

It stopped being a treat and became the water supply.

Two in three American adults drink coffee every day, and the ones who do average three cups. Nobody decided that. It crept up a cup at a time, each one poured to fix the dip the last one left.

Coffee is not the problem here. The morning cup is one of life's good things. Cups two and three are doing a different job, and they are doing it badly.

Source 8

The cup turns off the gauge. The tank is still empty.
07Reason 7 of 10

The real question: what fills the tank?

A woman in her fifties by a kitchen window in the morning with a glass of water, a kettle on the hob behind her

Something with no caffeine in it, taken in the morning instead.

The afternoon cup has one job: get you to six o'clock. It does that, and it charges you tomorrow for it.

Try a different routine. Keep the morning coffee. Move the thing you take for energy to the morning too, next to the kettle, and make it something with no caffeine to wear off.† Give it thirty mornings. If the three o'clock cup is still calling on day thirty, you have your answer, and you have lost nothing.

08Reason 8 of 10

What Irish kitchens kept on the stove, long before the coffee pot.

Selkie dropper bottle beside dried Irish sea moss on linen in morning light

For two hundred years there was no three o'clock cup. There was a pot of carrageen.

Irish sea moss grows on the rocks by the sea. People picked it at low tide. They dried it on the grass. They boiled it in milk until it set. Then they gave it to whoever in the house was worn out. No one called it a routine. No one measured it. A fistful in a pot was the amount, because that was the amount that did something.

Selkie is that, made stronger. Thirty parts of raw sea moss go into one part of the extract. You get 1,000mg of that extract in each serving. It also has 250mg of bladderwrack, 250mg of burdock root, and a 50mg complex so it works under your tongue. Every milligram is on the label.†

09Reason 9 of 10

Two droppers at the kettle. Nothing to wear off by bedtime.

A woman in her fifties taking Selkie from the amber dropper in morning light

Put the kettle on for the morning coffee. Two droppers while it boils.

There is no caffeine in it, so there is nothing left working at eleven at night. A liquid under your tongue skips the queue, so it does not have to go through your stomach before your body can use it. That is what the 50mg complex is for.

It tastes a little like the sea. It is seaweed. Anyone who says it tastes of nothing is not being straight with you. It is gone in about ten seconds, and then you have your coffee.

10Reason 10 of 10

Ninety days to make up your mind. Empty bottle included.

Selkie Liposomal Irish Sea Moss Blend, 2 fl oz amber glass dropper bottle

If you have tried things that did nothing, it is right to be wary.

You do not need another promise. You need room to find out. Selkie comes with a 90-day money-back promise. Take it for the full ninety days. If you do not feel a real difference, send it back and we refund you. An empty bottle is fine.

Here is what to expect.

  • Days 1 to 4. Nothing. You will still want the three o'clock cup. Have it if you want it.
  • Weeks 2 to 4. This is when most people who felt something first felt it. Often it was quieter than they expected.†
  • Month two. This is when the people who order again say they could tell. That is why the promise runs ninety days, not thirty. It is also why we sell three bottles at once.

Your first bottle is $29 when you subscribe. You get three free gifts and free shipping. You can pause, skip or cancel in two clicks.

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WHAT OUR CUSTOMERS ARE SAYING.

4.6 · Verified

Everyone is different. Each review is one person's story. It is not a promise of what you will get.

★★★★★

Kept seeing it on Facebook, so I gave it a go

My sister-in-law mentioned it, then it kept turning up in my feed. I'm 52 and had been told twice my bloodwork was normal and the rest was just my age. I wasn't convinced. Four weeks in and I've got more in the tank in the evenings. Small things, but real ones. It's earned its spot in the cupboard.

Lori W.
Received Selkie free to try.
★★★★★

I nearly didn't order. The guarantee is why I did.

Three years of being told everything looked fine. I'd tried enough things that didn't do anything that I wasn't keen to spend money on another one. The 90-day guarantee got me over the line. Two months on the dropper now and I notice it most around 3pm, which is when I used to flatten out. Nothing dramatic. Just better than I was.

Karen M.
Received Selkie free to try.
★★★★★

I read about two hundred reviews before I bought it

Six weeks in. I was skeptical because everyone kept saying the same thing. But I'm not dragging myself through the afternoon anymore, and my husband said I seem more like myself. That was the part that got me. Reordering.

Denise L.
Received Selkie free to try.
★★★★★

Get the three bottles. It needs time.

I bought the three-bottle bundle because the page was upfront that this is a 90-day thing, not a two-week thing. Glad I listened. The first month was hard to call. Somewhere in month two I stopped noticing I was tired, which I only realised when I went looking for it. On my third bottle now and switching to the subscription.

Patricia R.
Received Selkie free to try.
★★★★★

Two droppers, ten seconds, done. That's the whole thing.

Anne S.
Received Selkie free to try.
★★★★★

The taste is not lovely.

It's the sea. It's not strong and it's gone in a few seconds, but nobody should tell you it tastes of nothing, because it doesn't. I take it and get on with it. Two months and I'd carry on, I just wish someone had said.

Selkie repliedYou're right and we should say it plainly. It tastes faintly of the sea because it's seaweed. Under the tongue it's over in about ten seconds, which is why we don't recommend taking it in water.
Sheila M.
Received Selkie free to try.
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Selkie bottle on a butter yellow disc with a delph saucer and a glass dropper

QUESTIONS BEFORE YOU SKIP THE 3PM CUP.

SHOULD I GIVE UP COFFEE?

No. Keep the morning cup. We would.

This page is about the second and third cups, the ones poured at three because you're flat. Try moving what you take for energy to the morning, next to the kettle, and see if the three o'clock cup still calls by day thirty. If a doctor has told you to cut caffeine, do what they said.

IS SELKIE A COFFEE REPLACEMENT?

No. It has no caffeine, so it will not do what a coffee does in twenty minutes.

It is four things at a real amount, taken every morning for long enough to know. Some people find they want the afternoon cup less. Some don't. That is what the ninety days is for.†

WHY A LIQUID AND NOT A PILL?

A pill has to be swallowed and broken apart before your body can use what is in it. Whatever survives that is what you get.

Two droppers under your tongue skips all that. It is one dose, not a pill. And the amount is printed on our label, not hidden in a blend.

WHAT DOES IT TASTE LIKE?

A little like the sea. It is seaweed. Anyone who says it tastes of nothing is not being straight with you.

Two droppers under your tongue and it is gone in about ten seconds.

I TAKE THYROID MEDICINE. CAN I TAKE THIS?

Ask your doctor first. Bring the label with you.

Sea moss and bladderwrack both have iodine in them. The label lists every ingredient and how much. So your doctor can see just what is in a serving. That is a talk for the two of you, not for a website. The same goes if you are pregnant, nursing, or take any prescription.

WHAT IF IT DOES NOTHING FOR ME?

Send it back. We refund you. You have ninety days. An empty bottle is fine.

We would rather pay for that than have you keep paying for something that does nothing. We have both had a cupboard full of that.

WHEN WILL I NOTICE SOMETHING?

It varies. Anyone who gives you a number is guessing.

Most people who got something from it gave it a full month before they could tell. That is why the promise runs ninety days, not thirty.

SUBSCRIBE & SAVE · FIRST BOTTLE $29

A FEW REAL THINGS, AT A REAL AMOUNT.

For two hundred years, Irish kitchens kept a pot of this on the stove for anyone who was running on empty. Same seaweed, made thirty times stronger. Now it is two droppers under your tongue, first thing. Every milligram is on the label.

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Selkie bottle on a butter yellow disc with a delph saucer and a glass dropper

Sources

  1. Evans J, Richards JR, Battisti AS. Caffeine. StatPearls, National Library of Medicine, 2024. Caffeine works by blocking adenosine receptors, the brain's signal for tiredness.
  2. U.S. Food and Drug Administration. "Spilling the Beans: How Much Caffeine Is Too Much?" Consumer update. Half of the caffeine in a cup is cleared in four to six hours; too much caffeine can cause insomnia, jitters, a fast heart rate and an upset stomach.
  3. Drake C, Roehrs T, Shambroom J, Roth T. "Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed." Journal of Clinical Sleep Medicine, 2013;9(11):1195-1200. Henry Ford Hospital Sleep Disorders Center, Detroit. 400mg of caffeine six hours before bed cut measured sleep by more than an hour.
  4. Rogers PJ, Heatherley SV, Mullings EL, Smith JE. "Faster but not smarter: effects of caffeine and caffeine withdrawal on alertness and performance." Psychopharmacology, 2013;226:229-240. In regular consumers, caffeine mainly reversed the dip from going without it.
  5. Juliano LM, Griffiths RR. "A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity, and associated features." Psychopharmacology, 2004;176:1-29.
  6. National Coffee Association, National Coffee Data Trends, Spring 2025. 66% of American adults drink coffee daily; coffee drinkers average three cups a day.

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This page compares Selkie with the habit of drinking coffee in the afternoon. It is not about any one brand of coffee. Selkie contains no caffeine and is not a treatment for sleep problems or a replacement for coffee. Photos on this page are staged and use a model, not a customer. The author writes under a pen name. Nothing here is medical advice. If a doctor told you to take or stop taking anything, do what they said, and talk to them before you change anything. Sea moss and bladderwrack contain iodine. Ask a doctor before use if you take thyroid medicine, are pregnant or nursing, or take any prescription.