Built for the 3am wake-up

Falling asleep isn't the problem. Staying asleep is.

A racing mind at 3am. Leg cramps. Trips to the bathroom. If this is your night, the problem isn't falling asleep — it's staying there. Sleep Through is a nightly magnesium, L-theanine, glycine and electrolyte drink built for adults 45+, formulated for the second half of the night, not the first twenty minutes.

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Every stick: 222mg magnesium, 150mg L-theanine, 1500mg glycine, 130mg sodium, 90mg potassium

Circadian Signal Sleep Through pack, one month supply, all 3 flavours, with fruit and mineral props

Most sleep products chase the wrong problem

Falling asleep was never the hard part.

Melatonin and CBD are built to help you drop off. For a lot of people 45 and up, that's not where the night goes wrong.

Fall-asleep products

Melatonin, CBD gummies and drops — all engineered around the first twenty minutes. Once you're asleep, their job is basically done.

The Circadian Signal approach

Magnesium, L-theanine, glycine and electrolytes, dosed for the hours after lights-out — while your mind settles and your body runs through the night.

The difference

A formula built around the 3am wake-up, the overactive mind, and the nights that don't hold — not just the moment your head hits the pillow.

What's in every stick

Five actives, one job each.

222mg — Magnesium Glycinate

The gentle form

Chosen over magnesium citrate specifically because it's easier on the gut — a laxative effect is the last thing you want from a bedtime stick. Magnesium contributes to normal muscle function and the reduction of tiredness and fatigue.

150mg — L-Theanine

A quieter mind

An amino acid naturally found in tea leaves, included at a dose in line with the research literature on relaxation without sedation.

1500mg — Glycine

Restorative by design

The largest dose in the stick. Glycine is an amino acid studied for its role in the body's overnight rhythm, included here at a research-informed level.

130mg — Sodium

Fluid balance

The electrolyte your body loses steadily through the day, not just when you exercise. Sodium contributes to normal fluid balance and supports normal function of the nervous system.

90mg — Potassium

Muscle support

Alongside magnesium, potassium contributes to normal muscle function and supports normal function of the nervous system through the night.

Why we started

Two people, one bed, the same 3am problem — for completely different reasons.

It started with my wife and me lying awake at the same time most nights, for reasons that had nothing to do with each other. She was in her late 40s at the time — she's since moved fully into menopause — in the middle of the hormonal shifts of perimenopause: night sweats, leg cramps, wide awake at 3am for no obvious reason. I was 48, and my sleep had started fragmenting too, for a completely different reason: a mind that wouldn't switch off, no matter how tired I was.

Different causes, same shape. Falling asleep was never the problem for either of us — staying asleep was. That's when it became obvious that most sleep products are built entirely around the first twenty minutes, chasing melatonin and "fall asleep faster" claims, and almost nothing is built for the second half of the night, whatever's waking you up in the middle of it.

Sleep Through is what came out of that: magnesium, L-theanine, glycine and electrolytes, formulated for the hours after lights-out rather than the ones before it — for adults 45+ dealing with 3am wake-ups, however they got there.

— Jon & Clare, Circadian Signal

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One formula, delivered your way.

All 3 Flavours Included

Built for the 3am Wake-Up

Sleep Through

30 sticks, Lemon & Lime, Mixed Berries and Watermelon, ten of each. Magnesium glycinate, L-theanine, glycine and electrolytes, dissolved in water before bed. Choose your plan:

Prefer a rolling subscription? That'll be available at launch too.

Secure Your Supply — £29.99

Sleep Through

One pack, three flavours, thirty nights.

Every pack carries all three flavours in one shipment — Lemon & Lime, Mixed Berries and Watermelon — so the routine never gets boring before the month is out.

Magnesium glycinate — the gentler form, chosen deliberately over citrate.
150mg L-theanine — for a quieter mind before lights-out.
1500mg glycine — the largest single ingredient in the stick.
Sodium & potassium — electrolytes for normal muscle and nerve function.
8g stick — dissolves in water, no capsules to swallow.

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Lemon & Lime

Mixed Berries

Watermelon

Before you decide

The questions people actually ask us.

The form of magnesium matters more than most brands let on. A lot of cheaper products use magnesium oxide, which the body absorbs poorly. We use magnesium glycinate specifically for better absorption and a gentler effect on digestion — paired with L-theanine, glycine, sodium and potassium, rather than magnesium on its own.

Magnesium, L-theanine, glycine, sodium and potassium are generally well tolerated, but we're not able to give personal medical advice here. If you're on regular medication, particularly anything for blood pressure, thyroid function, or antibiotics, check with your GP or pharmacist before adding any new supplement.

No — there's no melatonin in Sleep Through at all. Melatonin is a sleep-onset hormone aimed at helping you drop off faster. Our formula doesn't touch that part of the night; it's built around magnesium, L-theanine, glycine and electrolytes for the hours after you've already fallen asleep.

Magnesium levels build gradually with consistent daily use, so we'd suggest sticking with it nightly for at least two to three weeks before judging whether it's working for you — which is also why the 3-month options tend to make more sense than a single pack on its own.

It's not habit-forming and there's no dependency risk from any of the ingredients. If you're on the subscription, you can pause or cancel before your next shipment at any time.

Sleep Through is a supplement, not a treatment for a diagnosed sleep or medical condition. If your sleep is severely disrupted, or you have symptoms that concern you, that's worth raising with your GP rather than relying on any supplement first.

Good to know

Frequently asked questions.

Each 8g stick contains 222mg magnesium (as magnesium glycinate), 150mg L-theanine, 1500mg glycine, 130mg sodium and 90mg potassium. No melatonin, no proprietary blends — every dose is printed on the pack.

Magnesium alone was never the whole story. Sweating, lower-carb eating, and normal day-to-day fluid loss draw down sodium and potassium too, not just magnesium — so we treat electrolyte balance as a set rather than a single mineral. Sodium contributes to normal fluid balance, and both sodium and potassium support normal function of the nervous system; potassium also contributes to normal muscle function alongside magnesium.

Magnesium citrate is a common, cheaper form — but it can have a laxative effect for some people, which isn't what you want from something you take right before bed. Glycinate is gentler on digestion.

No — there's no melatonin or sedative ingredient in the formula. It's designed to support a settled night, not to knock you out.

Dissolve one stick in a glass of water and drink it in the 30–60 minutes before bed, as part of a wind-down routine.

No need — every pack comes with all three flavours (Lemon & Lime, Mixed Berries, Watermelon), ten sticks of each, for the full 30-night supply.

We currently ship within the UK. US and EU shipping is on the way — sign up below and we'll let you know as soon as your region opens.