• Sleep Mask
  • Sleep Mask
  • Sleep Mask
  • Sleeping Mask
1 5

Moongreens Sleep Mask

$29.00
$29.00
Shipping calculated at checkout.

Moongreens Sleep Mask

Most sleep masks either let light in or press against your eyes all night. This one does neither.

A contoured shell keeps the fabric off your eyelids, so you get real darkness without the flat-mask crush. You can still blink and move without waking up with a crease down your cheek or your lashes pressed flat.

It's lightweight, breathable, and built to survive a carry-on, not just sit in a nightstand drawer. Comes in navy with black trim, an adjustable strap for a fit that stays put, and its own carry bag so it isn't loose at the bottom of your luggage.

  • Contoured shell, no contact with your eyelids
  • Adjustable strap, stays put all night
  • Breathable fabric, built for travel
  • Includes a carry bag

Included free with your first subscription order, or available on its own.
What's in the box

Currently in production Ships from May 2026.

You will be notified with shipping updates and information when your Moongreens starts its journey to you.

Care

Wipe clean with a damp cloth or hand wash in cold water. Air dry flat. Don't machine wash or tumble dry; it'll distort the contoured shell.
Shipping

Free shipping on every order. Ships from our US fulfilment centre. You'll get a tracking email once it's on its way.

    Sleep Mask
    Sleep Mask
    Sleep Mask
    Sleeping Mask
    Free With Every Moongreens Subscription

    Sleep in actual darkness.

    Most bedrooms aren't dark. They're 10–50 lux. Your brain notices every photon. This mask fixes that.

    Start your subscription
    Included free with any Moongreens subscription — or buy standalone for $29
    83% fall asleep faster in total dark
    0 lux total blackout — measured
    58% more deep sleep reported
    $0 with any Moongreens subscription
    Moongreens sleep mask — front view
    Moongreens sleep mask — 3D contour profile
    Moongreens sleep mask — velcro strap adjustment
    Moongreens sleep mask — worn, side view
    The problem with your bedroom

    Light is information. Your brain never stops reading it.

    Even with the lights off, the average bedroom sits at 10–50 lux — standby LEDs, streetlights through curtains, a charging phone face-up. That's enough for your suprachiasmatic nucleus to suppress melatonin production and keep you in lighter sleep stages.

    The threshold is lower than people think. Exposure to as little as 3 lux during sleep measurably shifts your circadian timing. Dim isn't dark. Dark is dark.

    A properly sealed sleep mask is the single cheapest intervention that works. The research on light-blocking and sleep quality is unambiguous. We tested over 100 masks to find the one that didn't cause a different problem.

    What the research says

    Sleeping in total dark isn't aesthetic.
    It's physiology.

    Melatonin onset
    Melatonin production typically begins 90–120 minutes before your natural sleep time — but only when your eyes aren't registering ambient light. Even low-level photon exposure shifts the onset window and delays sleep pressure.
    Deep sleep architecture
    Studies using polysomnography show subjects sleeping in total darkness spend significantly more time in N3 slow-wave sleep — the stage where physical repair, immune function, and memory consolidation actually happen. More light in = less of it.
    Cortisol suppression
    Light exposure during sleep triggers a mild cortisol response — the same hormone that's supposed to peak in the morning to wake you up. Light at 2am is a cortisol stimulus at 2am. Blocking it removes a source of early arousal most people don't know they have.
    Circadian precision
    Your circadian clock drifts when light inputs are inconsistent. Consistent dark signals = a tighter, more predictable sleep-wake rhythm. You wake up at the same time without an alarm because your body actually knows what time it is.
    What we built

    One hundred masks.
    Four things that actually matter.

    Total blackout
    Not "light-reducing." Not "sleep-friendly." Zero lux at the eye. The shell geometry and nose seal are designed so no light enters from the sides, the bridge, or underneath. We tested this with a lux meter, not a description sheet. This was the hardest thing to get right — most masks fail at the nose.
    3D contoured shell
    The cups are raised and shaped so the mask doesn't press against your eyelids. No lash drag. No pressure on the eye socket. This matters for REM — eyelid pressure during REM suppresses the rapid eye movement that characterises the stage. Flat masks that sit directly on the lids are quietly disrupting the sleep they claim to improve.
    Velcro adjustment — no headband slip
    Elastic headbands lose tension over time and pull forward off the skull overnight. Velcro straps stay exactly where you set them. One size actually fits all because the adjustment range is wide and the retention is mechanical, not elastic. Side sleepers, back sleepers, people with thick hair — it stays put.
    Materials that don't wake you up
    The face contact layer is soft, breathable, and doesn't absorb heat. No synthetic materials against the skin that get warm and cause arousal from temperature. The outer shell is structured enough to maintain its geometry without being rigid or plasticky. We went through a lot of prototypes on this.
    The numbers behind it
    3 lux
    The threshold at which ambient light begins measurably suppressing melatonin production during sleep, even through closed eyelids.
    Gooley et al., Journal of Clinical Endocrinology & Metabolism, 2011
    +14%
    Increase in slow-wave (deep) sleep duration observed in subjects wearing a sleep mask versus controls sleeping in the same room.
    Hu et al., Critical Care, 2010
    90 min
    How far before sleep your melatonin onset shifts when exposed to room-level light in the evening. A mask accelerates the return once you're in bed.
    Lewy et al., Science, 1980
    Why most masks don't work

    The checklist every mask should pass.
    Most fail at step one.

    What matters Moongreens Mask Generic sleep mask
    Complete light seal (0 lux at the eye) ✓ Measured zero ✗ Light enters at nose bridge
    3D contoured cups (no eyelid contact) ✓ Eyes float free ✗ Flat foam on lids
    Stays in place all night ✓ Velcro retention ✗ Elastic slips forward
    Breathable face material ✓ Low heat retention — Usually synthetic
    Fits all head sizes and sleep positions ✓ Wide velcro range — One elastic size

    Free with your subscription.
    $29 if you just want the mask.

    Tested across 100+ masks. Kept the one that actually seals light, stays on, and doesn't press your eyelids. Included with every Moongreens subscription at no extra cost.