Rest . Ritual . Ryvena
The science of
better sleep
Three things shape a night's sleep: how you breathe, how dark the room stays, and what your skin rests on. Every claim below is cited in full and labelled by where it comes from.
★★★ published study · ★★★ measured · ★★★ expert view
6×
More nitric oxide when you breathe through your nose
Your sinuses release nitric oxide into every nasal breath, a natural vasodilator that helps your lungs use oxygen. In a published study, air breathed in through the nose carried about six times more of it than air through the mouth. Keeping your mouth closed at night keeps you on the nose route.
Source: Törnberg DC et al., Eur Respir J 2002 1
The honest answer
Does mouth tape actually work?
The strongest science here isn't about tape. It's about your nose.
Breathing through your nose carries nitric oxide 1, gave higher blood-oxygen readings in healthy adults 2, and keeps your mouth from drying out and turning acidic overnight 7. Tape simply keeps your lips together so you stay on the nose route.
The research on taping itself is young and encouraging: in mouth-breathers with mild sleep apnoea, taping cut snoring by half 6.
One honest note: tape is a sleep aid, not a medical treatment. If you have a blocked nose, diagnosed sleep apnoea or snore heavily, check with your doctor first. Our full Caution Statement says the same.
Breathing
Breathe through
your nose
The nose filters, warms and humidifies every breath. The mouth does none of it.
“The missing pillar in health is breath.”
James Nestor · Author, Breath
6×
More nitric oxide through the nose
★★★ Published study10%
Higher blood oxygen
★★★ Published studyIn a Karolinska Institute study, healthy adults had 10% higher blood-oxygen readings breathing through the nose versus the mouth.
Source: Lundberg JO et al., Acta Physiol Scand 1996 2
↓
Lower airflow resistance
★★★ Published studyNasal strips lower airflow resistance by widening the nasal valve, with the strongest effect in naturally narrow or congested noses.
Source: Kirkness JP et al., Eur Respir J 2000 3
10 days
Mouth breathing, then nose
★★★ Expert viewNestor's Stanford self-experiment: ten days of forced mouth breathing brought snoring and broken sleep, which stopped when he switched back to the nose.
Source: Breath (2020); Pulmonology Advisor 4
Good to know: Two people, two ten-day phases. A strong story, not a trial.
“Mouth breathing during sleep is not just undesirable; it is actually dangerous.”
Dr Andrew Huberman · Neuroscientist, Stanford University 5
½
Snoring cut by half
★★★ Published studyIn mouth-breathers with mild sleep apnoea, taping cut the snoring index from about 304 to 121.
Source: Lee YC et al., Healthcare (Basel) 2022 6
Good to know: The effect is strongest for snoring and mild cases. Tape is a sleep aid, not a medical treatment.
Teeth, gums and breath
Your mouth pays for
mouth breathing
pH 3.6
Mouth breathing turns your mouth acidic
★★★ Published studyIn a sleep study of 10 healthy adults, average pH fell from a neutral 7 to 6.6 overnight with mouth breathing, and at times to 3.6.
Source: Choi JE et al., J Oral Rehabil 2016 7
69% vs 38%
Gums healed better in nose breathers
★★★ Published studyAfter a deep clean for gum disease, 69% of deep gum pockets on the inner upper back teeth healed in nose breathers, against 38% in mouth breathers.
Source: Kaur M et al., BDJ Open 2018 8
3×
Higher odds of bad breath
★★★ Published studyChildren who mouth-breathed had three times the odds of bad breath compared with nose breathers.
Source: Alqutami J et al., Eur J Paediatr Dent 2019 9
Good to know: Studied in children aged 10 to 15.
The answer
Stay on the nose route
Nose Strips
Up to 50% more airflow. Drug-free, latex-free.
Mouth Tape
Keeps you breathing through your nose all night. Central vent slot, so nothing feels sealed shut.
Prefer them together? That’s the Breathing Ritual.
Darkness
Sleep in real darkness
“We are a dark deprived society. We get what I call ‘junk light’ at night.”
Dr Matthew Walker · Professor of Neuroscience, UC Berkeley 10
24 lux
A dim lamp halves melatonin
★★★ Published studyMelatonin is suppressed by very little light. In one study the average level that halved melatonin was about 24 lux, roughly a dim lamp.
Source: Phillips AJK et al., PNAS 2019 11
+18%
More REM sleep in real darkness
★★★ Expert viewWalker cites a study where dimming lights below 30 lux for 90 minutes before bed, and cutting the blue out, increased REM sleep by 18%.
Source: The Diary of a CEO, Nov 2025 10
Good to know: Quoted on a podcast; the original study isn’t named.
Unbroken sleep counts
★★★ Expert viewWalker rates sleep continuity, unbroken stretches, as mattering as much as hours. Light that wakes you breaks exactly that.
Source: The Diary of a CEO, Nov 2025 10
More alert the next day
★★★ Published studyIn a 2023 trial, people encoded memories better and were more alert the day after sleeping in an eye mask.
Source: Greco V et al., Sleep 2023 12
Contoured Silk Sleep Mask
Total blackout. Zero eye pressure: the cups don’t touch your eyes or lashes.
Silk
Sleep on silk
No expert quote here. This one wins on material fact.
Lower friction
★★★ MeasuredIndependent hair-friction testing shows silk has a lower friction coefficient against hair than cotton: less snag, less tug, less breakage.
Source: TRI Princeton, Dec 2025 13
Less moisture lost
★★★ Expert viewCotton absorbs more water than silk, so silk draws less of your skin’s moisture and your skincare away overnight.
Source: TRI Princeton, Dec 2025, citing Otomasu et al. 13
22
Momme, not 16–19
★★★ MeasuredMomme is the objective weight measure of silk density (1 momme ≈ 4.34 g/m²). Most “premium” silk sits at 16–19. Publishing the number is a check competitors can’t fake.
Source: RYVENA product specification
Class I
OEKO-TEX® Standard 100
★★★ MeasuredProduct Class I, certificate SH025 240363 (TESTEX). Class I is the strictest tier, the one applied to products for babies.
Source: OEKO-TEX certificate 14
Silk Pillowcase
Frictionless: less breakage, fewer tangles. Helps skin hold moisture overnight.
Built to real
standards
// Note
RYVENA products are general wellbeing and comfort products, not medical devices. If you have a diagnosed sleep or breathing condition, speak with a health practitioner before use.
14 sources.
Every claim cited.
- Törnberg DC et al. Nasal and oral contribution to inhaled and exhaled nitric oxide. European Respiratory Journal 2002;19(5):859–864.
- Lundberg JO et al. Acta Physiologica Scandinavica 1996;158(4):343–347.
- Kirkness JP, Wheatley JR, Amis TC. European Respiratory Journal 2000;15(5):929.
- Nestor J. Breath (2020); Pulmonology Advisor interview.
- Huberman Lab, public post, August 2022.
- Lee YC et al. Healthcare (Basel) 2022;10(9):1755.
- Choi JE et al. Journal of Oral Rehabilitation 2016;43(5):356–363.
- Kaur M et al. BDJ Open 2018;4:17039.
- Alqutami J et al. European Journal of Paediatric Dentistry 2019;20(4):274–279.
- Walker M. The Diary of a CEO, November 2025.
- Phillips AJK et al. PNAS 2019;116(24):12019.
- Greco V et al. Sleep 2023;46(3):zsac305.
- TRI Princeton. Everyone is talking about: silk pillowcases. December 2025 (hair-friction testing; cites Otomasu et al. on water absorption).
- OEKO-TEX® Standard 100, Product Class I, SH025 240363, TESTEX.