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Built for the 3am wake-up

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

A racing mind at 3am. Leg cramps and restless legs. 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 and glycine drink built for adults 45+, formulated for the second half of the night, not the first twenty minutes.

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Formulated with 222mg magnesium glycinate, 150mg L-theanine, 1500mg glycine per sachet
Magnesium Glycinate Formula
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30-Night Supply, 3 Flavours
Non-Habit-Forming

The signal to stay asleep.

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 and glycine, 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 sachet

Three ingredients, 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 sachet. 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 sachet. Glycine is an amino acid studied for its role in the body's overnight rhythm, included here at a research-informed level.

Why we started

Built for the sleep that fragments, not the sleep that never starts.

Circadian Signal started with a simple observation: most sleep products are built for people who can't drop off, and almost none of them are built for people who drop off fine and then wake up at 3am staring at the ceiling — racing mind, leg cramps, restless legs, one more trip to the bathroom. That's a different problem, and it deserves a different formula.

Sleep Through is the first product — a magnesium, L-theanine and glycine drink built for the second half of the night, for adults 45+ dealing with overnight wake-ups, restlessness, and a mind that won't switch off at 3am.

— Founder, Circadian Signal

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One formula, delivered your way.

All 3 Flavours Included
Built for the 3am Wake-Up

Sleep Through

30 sachets — Lemon & Lime, Raspberry and Watermelon, ten of each. Magnesium glycinate, L-theanine and glycine, dissolved in water before bed.

Secure Your Supply — £69.99/3mo
Sleep Through

One box, three flavours, thirty nights.

Every box carries all three flavours in one shipment — Lemon & Lime, Raspberry 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 sachet.
  • 15g sachet — dissolves in water, no capsules to swallow.
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Lemon & Lime
Raspberry
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 and glycine, rather than magnesium on its own.

Magnesium, L-theanine and glycine 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 and glycine 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 box on its own.

It's not habit-forming and there's no dependency risk from any of the three 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 15g sachet contains 222mg magnesium (as magnesium glycinate), 150mg L-theanine and 1500mg glycine. No melatonin, no proprietary blends — every dose is printed on the box.

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 sachet 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 box comes with all three flavours (Lemon & Lime, Raspberry, Watermelon), ten sachets 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.

Stay in the loop.

Restock alerts, new flavours, and no spam — just the signal.