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Tested by a customer, on his own sleep tracker

He sent us the data unprompted. We’ve published all of it, including how the tracker works.

Customer case study · measured, not claimed

The night the waking stopped

A customer replaced his existing premium sheets with ours and sent us what his sleep tracker recorded on either side of the change. Both nights, side by side.

Night 1 · his old sheets

Seven returns toward awake

Night 2 · Cozy Cooling Sheets

One continuous block

Sleep quality73% → 79%+6 points

Time asleep5h 55m → 6h 39m+44 minutes

Time in bed6h 43m → 7h 37m+54 minutes

“I tried your product yesterday, replacing a very expensive set that I had, and the difference is amazing.”
Michel A. · sent to us unprompted, the day after

He wrote to us first

None of this was solicited — no review request, no discount for posting, no brief. He bought the sheets, slept on them, and sent this the following afternoon.

Michel A. Instagram direct message

Just wanted to say WOOOOW WOOOOW WOOOOW… I tried your product yesterday, replacing a very expensive set that I had, and the difference is amazing… I’ll share with you the sleep pattern I had… Really appreciate the work put into it and your quick shipping and delivery… Thank you for making my sleep better

*it took me longer to sleep cause I was free falling through the internet rabbit hole trying to figure out the type of fabric you used and why it’s magical like that

What changed, and what didn’t

SubjectMichel A., verified customer

Change testedSwapped his existing premium sheet set

DesignNight 1 vs. Night 2, back to back

InstrumentSleep Cycle, on his own phone

Same bedroom, same bed, same phone in the same place, same app in the same mode, one night apart. That’s what makes the two graphs comparable to each other.

Both nights, on one clock

His two screenshots covered slightly different hours, so we’ve redrawn both on a single shared time axis. The underlying figures are his, unchanged.

Night 1 · previous sheets In bed 6h 43m · Asleep 5h 55m · Quality 73%

Night 2 · Cozy Cooling Sheets In bed 7h 37m · Asleep 6h 39m · Quality 79%

On the second night he took 57 minutes to fall asleep — the flat stretch at the start. His own explanation: he was up reading about what the fabric was made of.

What this shows

That one customer’s tracker recorded a fragmented night on his old sheets and a continuous one on ours, twenty-four hours apart, with the sheets as the variable that changed.

Because both nights were measured the same way, on the same device, in the same room, they can fairly be compared to each other. A single case can’t tell you what would happen for everyone — it tells you what happened for him.

Sleep data voluntarily shared by a Cozy on Cozy customer and redrawn from his own Sleep Cycle screenshots; the underlying figures are unchanged. Quoted with his permission, surname withheld at his request. Single subject, two consecutive nights — individual results vary.
Cozy Cooling Sheets are a comfort product, not a treatment for any medical condition.

The instrument

Sleep, measured by sound

Sleep Cycle is one of the most widely used sleep trackers in the world, and it works without anything on your wrist or under your mattress. The phone sits on the nightstand and listens. The method is patented, and the company has built one of the largest sleep datasets in the world from tens of millions of users.

How it works

STEP 01

It listens

The microphone picks up the sounds of the bed — breathing, shifting, turning over, snoring.

STEP 02

It separates signals

Rustle reads as movement. A slow steady rhythm reads as breathing. Sharp peaks get flagged as snoring.

STEP 03

It reads the pattern

A trained model tracks how much you move and how regular your breathing is, minute by minute.

STEP 04

It draws your night

That becomes the curve you see in the morning, plus your times and your quality score.

Why listening tells you something real

Sleep genuinely changes how a body behaves, in ways you can hear from across the room. Awake in bed, you shift often and your breathing is irregular. As you fall asleep, movement drops away and breathing settles into a slow, remarkably even rhythm. Those are real physiological changes, not statistical artefacts.

Movement falls off and breathing locks into a slow, even rhythm — then both reverse in the morning. This is the pattern the app reads all night.

What it reports

Time in bed & time asleep

The window the night sits inside, and how much of it was scored as sleep.

Sleep quality

A single percentage summarising duration, continuity and how the night compares to your own pattern.

Sound events

Snoring, coughing and talking, logged with timestamps.

Sleep Cycle is an independent third-party app developed by Sleep Cycle AB. Cozy on Cozy has no commercial relationship with them and receives nothing from mentioning the app. It is a consumer wellness app, not a medical device. Technical description drawn from Sleep Cycle’s own published documentation.

Designed to respond to your body temperature needs - Wake up refreshed, not freezing.

Cozy Cooling Technology Infused fabrics that ensures your body stays at that perfect temperature. All night long.

Cooler fabric = less sweat = less odor = less laundry

The Cozy Cooling Sheets stay for 3x longer than cotton thanks to its antibacterial properties. That means up to 3x less laundry and fewer odors.

Silky soft feeling that lasts for years.

Premium quality OnCozy™ fabrics that feel more luxurious than silk and stay soft no matter how many times you wash them.

Smart Design for a cleaner sleep environment

cozy cooling technology + natural antibacterial properties leads to:

V/S

Less sweat

More deep, undisturbed sleep

Less odors

More fresh starts to your days

Less pimples

More confidence in your own skin

Less bedheads

More wake up-and-go mornings

Bye Bye Morning Cloginess

Our OEKO-TEX certified fabrics are designed for hypoallergenic sleep making sure you won’t suffer from a stuffy nose, congested throat or puffy eyes when you wake up in the morning.

88% of surveyed customers reported better rest

Thousands of our customers are waking up more refreshed and energized thanks to deeper sleep. Don’t let morning stuffiness or constant temperature changes ruin your sleep.

No one does comfort better than us

Since 2019, we’ve made the life of over 100,000+ customers better by finding easy and practical solutions that fit in your daily life.

30 Nights Money-Back Guarantee

We’re so confident you’re going to love these sheets that we’re to let you try them for 30 nights. If you don’t like them, we’ll refund all your money, no questions asked.

100% Satisfaction

Fast Shipping

Easy Returns

Customer Reviews

Overall rating: 5.0 / 5 from 6079 reviews.

Cool

Fadia M. 5/5 Verified September 16, 2025

Language

Language

Clinically tested sheets that feel like the cold side of the pillow everywhere, all the time.

INVEST IN YOUR HEALTH, NOT JUST YOUR SLEEP

INVEST IN YOUR HEALTH, NOT JUST YOUR SLEEP

IMPROVES SLEEP QUALITY

SELF CLEANING

SENSITIVE SKIN FAVORITE

HEALTHY HAIR ESSENTIAL