Product dossier · The physics of darkness · Read through sleep science
Your eyes keep working even when they’re shut.
A 100% mulberry-silk eye mask built around one physical fact: closed eyelids don’t fully block light, and the cells that set your body clock don’t need you to be looking at anything to respond.
The Tattwas Sleeping Eye Mask · 100% Mulberry silk · 22 momme · contoured eye cups — Evidence-based · Zero eye-pressure · Nothing oversold
Rs. 199
MRP Rs. 299
33% OFF
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<1 luxthe scientific consensus target for a dark sleeping room
36–56%melatonin suppression measured through closed eyelids
22 mommemulberry-silk weight — dense, opaque and soft
Read this first
A mask is a sleep-hygiene tool, not a treatment. It blocks light to the <1 lux target — it doesn’t cure a sleep disorder. Where the evidence is thin, we say so.
01 · Why an eye mask
Closing your eyes doesn’t make the room dark.
The eye has a second light system that has nothing to do with seeing. Cells called ipRGCs simply measure how much light is present and report it straight to the brain’s master clock — which decides how much melatonin you make. Closed eyelids filter that light; they don’t switch it off.
This is why an artificially bright bedroom can leave you groggy after a full night: the clock drifted out of sync, even though your eyes were shut the whole time.
🌅
Dawn before your alarm
REM peaks in the final hours of sleep — the exact window when a gap in the curtains or an early sunrise reaches the retina.
🪟
Blackout curtains that leak
Measured with a lux meter, “blackout” curtains often still read 10–50 lux; light travels around the fabric edges, not just through them.
💡
Standby lights and streetlight
A standby LED, a hallway glow, a streetlight through a gap — small sources routinely exceed the <1 lux target on their own.
🧳
Travel, shift work, shared rooms
The one variable you can control anywhere — a hotel, a night shift, a partner who reads late — is the light at your own eyes.
The honest limit
A mask treats the light reaching your eyes. It doesn’t quiet a racing mind, fix caffeine too late, or replace a consistent bedtime — it removes one specific, measurable obstacle, and only that one.
02 · How it works
Physics, not a promise.
Two separate pathways leave the same eye. One builds the picture you see; the other just measures brightness for the clock — and it keeps measuring while you sleep.
Two separate pathways leave the same eye. The ipRGC pathway reports light level to the SCN — the master body clock — which moves melatonin up or down. The rod/cone pathway goes to the visual cortex for conscious sight. The mask blocks stray light at the eye.
1
Eyelids filter, they don’t block
Thin eyelid tissue transmits a real fraction of light, and some wavelengths pass more easily than others.
2
The clock reads brightness without vision
Melanopsin cells (ipRGCs) report light levels straight to the SCN — even while you’re fast asleep.
3
Light suppresses melatonin, fragments REM
Light through closed lids cut melatonin 36–56% in controlled testing; even brief waking shortens a REM period.
4
A physical seal removes the variable
A snug mask blocks stray light regardless of wavelength or how thin your eyelids are — no reliance on curtains.
03 · What it does — graded
Four honest benefits, each with its evidence grade.
We grade what we claim. A mechanism nobody disputes and a finding from one small population are different things — so we mark which is which, rather than listing only the flattering line.
🌑
Reaches the <1 lux target
Eyelids transmit meaningful light, and even blackout curtains leak around the edges. A sealed mask closes the gap that curtains physically can’t.
Mechanism · direct🛌
Better sleep in randomized trials
Multiple RCTs in intensive-care units — a deliberately rigorous setting — found improved sleep quality, more deep sleep, and better melatonin and cortisol profiles with a mask.
RCT · ICU population🌇
Protects the light-sensitive hours
Your longest REM stretches fall in the final hours before waking — exactly when dawn light rises. Darkness is doing its hardest work at precisely that time.
Mechanism · not disputed🧵
Silk’s lower friction is real
Silk has measurably less friction against skin than cotton — genuinely comfortable over hours of contact. Independent proof of anti-wrinkle claims is thin, and we don’t make them.
Material property · modest04 · Why choose Tattwas
Contoured to block the light, not press on the eye.
A flat mask pressed to the face still gaps at the nose and temples — the same place blackout curtains fail — and it presses on eyelids that need to move during REM. Ours is shaped to seal those gaps while clearing the eye entirely.
🧶
100% Mulberry silk, 22 momme
A dense, opaque weave with a low-friction surface — gentle over hours of overnight skin contact.
👁️
Contoured eye cups
Zero pressure on the eyelids or lashes, leaving a full range of REM eye movement undisturbed.
🫧
Nose & temple seal
Shaped edges close the exact gaps a flat mask leaves open at the bridge of the nose and the temples.
🎗️
Fully adjustable strap
No pressure on the ears or scalp — and no slipping off partway through the night.
Design · what’s genuinely true · verdict
| Design | What’s genuinely true | Verdict |
|---|---|---|
| Contoured silk cup (ours) | Clears the eyeball, seals at nose and temples, low-friction silk. Costs more than a flat strip. | Our choice |
| Flat pressure-fit mask | Cheap and packs flat — but presses directly on the eyes and gaps at the nose and temples. | Workable |
| Weighted / padded mask | Blocks light, and some find the gentle pressure soothing — but it rests weight on the eyes. | Preference |
| Thin or light-coloured fabric | Can work with genuinely dense blackout construction; less reliable than a sealed dark cup. | Workable |
On the material, precisely
Silk’s lower friction is a real, measurable property — that’s why we use it. The specific “prevents wrinkles” statistics online trace to brand-commissioned studies, not independent trials. If skincare is your only reason to buy, we’d rather tell you the evidence there is thin than sell you on it.
05 · How to use
Small habits, the same 1-lux logic.
1
Dim the lights early
Lower household lighting 60–90 minutes before bed. The mask finishes the job — it doesn’t replace winding down.
2
Fit it before you sleep
Adjust the strap so the nose and temple seals sit flush, with no gap for light to slip in.
3
Keep the schedule consistent
The body clock resets best on a regular light/dark rhythm, not just a dark room on occasional nights.
4
Pair with morning light
Bright light soon after waking anchors the same clock the mask protects at night.
After use · Weekly · Always
🌬️
After use
Air it out and keep it away from creams and oils between nights.
🧺
Weekly
Hand wash cold, or a delicate machine cycle inside a mesh bag, then air dry.
🕰️
Always
A consistent sleep and light schedule; the mask supports the rhythm, it doesn’t set it alone.
06 · Benefits backed by research
What the studies found — including the caveats.
We separate findings measured directly from association studies, and name every source. Some of it isn’t uniformly flattering, so we publish the grade next to each line.
| Finding | What the study showed | Grade |
|---|---|---|
| Light through eyelids | Light delivered through closed eyelids suppressed melatonin 36–56%, the effect worsening toward the end of the night. Figueiro & Rea, 2012 · BMC Research Notes | Measured |
| ICU sleep quality | Better sleep quality and depth, fewer awakenings, and improved melatonin/cortisol vs no mask (P<0.05). Hu et al., 2015 · Critical Care · RCT | RCT |
| Deep (N3) sleep | A higher proportion of restorative slow-wave sleep, confirmed on polysomnography. Le Guen et al., 2014 · ICU · PSG | RCT · PSG |
| Sleep-quality score | A significant improvement in sleep-quality score versus control in a crossover trial (P=0.001). Chaudhary et al., 2020 · Crit Care Res Pract | RCT |
| Light at night & metabolism | A single night at ~100 lux raised next-morning insulin resistance and heart rate vs a dim room. Mason et al., 2022 · PNAS | Single-exposure |
| Silk friction | Independent textile testing shows roughly 40%+ lower friction against skin than standard cotton. Friction-coefficient lab data, silk vs cotton | Material property |
Read this correctly
The strongest mask trials come from intensive-care units — rigorous, but a specific population sleeping in hard conditions. The light-at-night health studies show a consistent direction across independent groups, not proof that darkness alone prevents disease. We won’t claim it does.
07 · Safety
A sleep-hygiene tool, not a treatment.
It’s a sleep-hygiene accessory, not a medical device. It supports the light/dark rhythm your sleep depends on — it doesn’t treat a sleep disorder.
🩺 Check with a doctor first
Recent eye surgery
Recent eye surgery, or an eye condition where any pressure is a concern.
Silk or protein-fibre allergy
A known silk or protein-fibre allergy.
Sleep apnea
Sleep apnea or any condition where you rely on being easily woken by light.
✅ Good practice, every time
Wash it regularly
Wash it regularly — anything worn against the face gathers oil and residue.
Stop use if you notice skin irritation and check the cause before continuing.
The Tattwas Sleeping Eye Mask is a comfort and sleep-hygiene accessory, not a medical device. It is not intended to diagnose, treat, cure or prevent any disease, including sleep disorders.
08 · FAQs
The questions people actually ask.
Does a mask really block enough light?
Closed eyelids only filter light; measured with a lux meter, even blackout curtains often leak 10–50 lux. A snug, dense mask is the reliable way to reach the <1 lux consensus target.
Won’t it press on my eyes?
Not this one. The contoured cups clear the eyeball so your eyes move freely during REM — that’s the whole reason for the shape, rather than a flat strip pressed to the lids.
Does silk actually prevent wrinkles?
Silk’s lower friction against skin is real and measurable. The specific anti-wrinkle statistics online trace to brand-funded studies, so we don’t make that claim.
Why black, and does colour matter?
A dark surface absorbs more stray light than a pale one — but weave and thickness matter just as much. We use black because it’s the simpler, reliably effective choice, not a magic switch.
Is the research just marketing?
No. Sleep masks have been tested in randomized controlled trials, mostly in intensive-care units. That’s rigorous but a specific population — we say so rather than overstating it.
Who shouldn’t use one?
Anyone with recent eye surgery, a silk or protein-fibre allergy, or a condition where being woken by light matters — some sleep-apnea situations included. Check with a doctor first.
How do I wash it?
Hand wash cold, or a delicate machine cycle inside a mesh bag, then air dry. Keep it away from creams and oils between washes.
Will it fix my insomnia?
It’s a sleep-hygiene accessory, not a medical device. It supports the light/dark rhythm your sleep depends on — it doesn’t treat a sleep disorder.
09 · Scientific evidence
The evidence, in full.
Every claim traces to one of these. Where a source complicates a benefit we’d like to claim, it’s still listed rather than quietly dropped.
Circadian light science
01Recommendations for daytime, evening and nighttime indoor light exposure
Brown TM, Brainard GC, Cajochen C, et al. (2022). PLOS Biology, 20(3):e3001571.
02Light through the eyelids can suppress melatonin and phase-shift dim-light melatonin onset
Figueiro MG, Rea MS. (2012). BMC Research Notes, 5:221.
03Suppression of melatonin by 2000-lux light in humans with closed eyelids
Hätönen T, et al. (1999). Brain Research.
04Phototransduction by retinal ganglion cells that set the circadian clock
Berson DM, Dunn FA, Takao M. (2002). Science.
Light at night & health
05Light exposure during sleep impairs cardiometabolic function
Mason IC, Grimaldi D, Reid KJ, et al. (2022). PNAS, 119(12):e2113290119.
06Cohort studies on bedroom light-at-night exposure and cardiometabolic / obesity outcomes in older adults
Obayashi K, et al.
07Bedroom light exposure and health outcomes, Sister Study (n=47,765)
Sweeney A, Nichols HB, et al. (2024). Sleep.
Clinical evidence for sleep masks
08Earplugs and eye masks on sleep, melatonin and cortisol in ICU patients: an RCT
Hu RF, Jiang XY, Hegadoren KM, Zhang YH. (2015). Critical Care, 19:115.
09Earplugs and eye mask on sleep in critically ill patients: a randomized study
Le Guen M, et al. (2014). Critical Care.
10Sleep promotion in critically ill patients: an RCT
Chaudhary A, Kumari V, Neetu N. (2020). Crit Care Res Pract, 2020:8898172.
11Earplugs and eye masks in the ICU: a systematic review
Polat E, et al. (2022). Dubai Medical Journal.
Material
12Independent friction-coefficient testing of silk vs cotton textiles
Silk’s lower friction as a measurable material property.
13Light absorption, reflection and opacity principles for blackout textiles
General materials-science literature.
Sleep architecture & REM
14Neuroscience (2nd ed.) — Stages of Sleep
Purves D, et al. NCBI Bookshelf, NIH.
15Brainwave frequencies across the sleep stages
Sleep Foundation.
16EEG patterns by stage; REM/NREM cycle structure
OpenStax Psychology 2e, §4.3.
17Physiology, Sleep Stages
StatPearls, NCBI Bookshelf, NIH — stage duration and share of sleep.
18Sleep and the glymphatic system
Slow-wave sleep, growth-hormone secretion and waste clearance.
19Slow-wave and REM sleep in emotional-memory consolidation
Communications Biology (2025).
20Rapid eye movements reveal a cognitive process during sleep
Senzai Y, Scanziani M. (2022). Science, 377(6609):999–1004.
How we use the grades
This dossier distinguishes independently replicated findings from single trials, association studies and brand-commissioned research throughout.
The full, continually-updated clinical studies list lives at tattwas.com.
The Tattwas Sleeping Eye Mask is a comfort and sleep-hygiene accessory, not a medical device, and is not intended to diagnose, treat, cure or prevent any disease, including sleep disorders. This page summarises published research and public-health guidance; it is not medical advice.