Sleep Mask
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What it is
Wearing a contoured, light-blocking eye mask during sleep to eliminate ambient light that suppresses melatonin and disrupts circadian signalling. A well-fitted mask blocks the great majority of light from streetlamps, early sunrise, and device indicators. The intervention is most useful for people whose sleeping environment is not already very dark – urban dwellers, people whose partner keeps a different schedule, shift workers, and frequent travellers. For someone who already sleeps in a black-out bedroom, the marginal benefit is modest.
Sources and key statistics
- Wearing a contoured light-blocking eye mask during sleep to suppress ambient light that interferes with melatonin signalling and sleep continuity
- Most relevant for people in urban environments, with a partner on a different schedule, doing shift work, or travelling frequently; marginal for those who already sleep in a fully dark room
- Light exposure during sleep measurably elevates next-morning insulin resistance and overnight heart rate even at modest intensity
- Eye masks combined with earplugs in ICU settings improved REM sleep, reduced awakenings, and lowered cortisol and elevated melatonin
- One-time cost of $10–30 for a basic mask; no recurring effort beyond putting it on at bedtime
Cost
- Upfront cost: $15
- Ongoing cost: $10/year
- Upfront time: 0.25 hours
- Ongoing time: 0 hours/week
Personalise these costs
Override the population estimates with your own. Saved to your profile and used to recalculate Time and Money EROIs.
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How to do it
- Pick a contoured (3D) mask that sits around the eyes without pressing on the lids; flat fabric masks tend to leak light around the nose bridge and squash the eyes
- Wear it for several consecutive nights to adapt before judging comfort – most people habituate within a week or so
- If the mask shifts during the night, try a wider elastic, an adjustable Velcro strap, or a wrap-around design
- Keep a spare in your travel bag and bedside drawer so the habit is not interrupted by wear, loss, or being away from home
What success looks like
- You stop waking prematurely from early-morning light or ambient glow, and feel that mornings are less abrupt
- Putting the mask on takes seconds and integrates into your existing wind-down without conscious effort
- You notice a clear difference on nights you forget it, confirming the effect is real for your environment
Common pitfalls
- Buying a cheap flat mask that lets light leak around the nose – inadequate light blocking removes the primary mechanism
- Abandoning after two or three uncomfortable nights instead of trialling a different shape; comfort varies a lot between designs
- Treating the mask as a fix-all when the dominant disruption is actually noise, temperature, caffeine timing, or a partner’s movement
- Expecting the same benefit as users in a bright bedroom when your room is already dark – the gain is roughly proportional to how much ambient light you currently get
Prerequisites
- Tolerance for material covering the eyes during sleep – a minority find this intolerable regardless of mask design
- No medical condition affecting the eye area that contraindicates pressure or coverage (e.g., recent eye surgery)
- Sleeping environment where a mask realistically stays in place – very restless sleep or certain face-down positions can dislodge it
Expected effects across life areas
| Life area | Value | PBS | ISR | UAR | Confidence | Baseline (population percentile) | EBS |
|---|---|---|---|---|---|---|---|
| Sleep | Daily functioning | 5 | 55% | 55% | medium | 35th | … |
| Sleep | Long-term health | 4 | 35% | 55% | low | 35th | … |
| Sleep | Comfort & experience | 6 | 65% | 60% | medium | 35th | … |
Detailed Scoring
Scoring uses a logarithmic scale from 0 to 10, where each unit increase represents roughly double the impact. Learn more about ROI calculations.
Sleep – Daily functioning
Anchor: Productive hours per day of sustained cognitive and physical performance
Logarithmic Scale:
- Score 10: 14 productive hours per day
- Score 8: 3.5 productive hours per day
- Score 6: 50 productive minutes per day
- Score 4: 13 productive minutes per day
- Score 2: 3 productive minutes per day
- Score -2: ~3 productive minutes per day lost
- Score -4: ~13 productive minutes per day lost
- Score -6: ~50 productive minutes per day lost
- Score -8: ~3.5 productive hours per day lost
- Score -10: 14 productive hours per day lost
Potential Benefit Score (PBS):
5
Intervention Success Rate (ISR):
55%
User Adherence Rate (UAR):
55%
Expected Benefit Score (EBS):
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Sleep – Long-term health
Anchor: Additional healthy lifespan from optimal sleep
Logarithmic Scale:
- Score 10: 8+ years additional healthy lifespan
- Score 8: 2 years additional healthy lifespan
- Score 6: 6 months additional healthy lifespan
- Score 4: 2 months additional healthy lifespan
- Score 2: Few weeks additional healthy lifespan
- Score -2: Few weeks of healthy lifespan lost
- Score -4: 2 months of healthy lifespan lost
- Score -6: 6 months of healthy lifespan lost
- Score -8: 2 years of healthy lifespan lost
- Score -10: 8+ years of healthy lifespan lost
Potential Benefit Score (PBS):
4
Intervention Success Rate (ISR):
35%
User Adherence Rate (UAR):
55%
Expected Benefit Score (EBS):
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Sleep – Comfort & experience
Anchor: Change in how restorative and pleasant the sleep experience is
Logarithmic Scale:
- Score 10: Transformative gain in quality of sleep experience
- Score 8: Major gain in quality of sleep experience
- Score 6: Meaningful gain in quality of sleep experience
- Score 4: Modest gain in quality of sleep experience
- Score 2: Slight, barely noticeable gain in quality of sleep experience
- Score -2: Slight, barely noticeable reduction in quality of sleep experience
- Score -4: Modest reduction in quality of sleep experience
- Score -6: Meaningful reduction in quality of sleep experience
- Score -8: Major reduction in quality of sleep experience
- Score -10: Severe damage to quality of sleep experience
Potential Benefit Score (PBS):
6
Intervention Success Rate (ISR):
65%
User Adherence Rate (UAR):
60%
Expected Benefit Score (EBS):
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