Do blue light glasses help sleep? What the studies show
Do blue light glasses help sleep? The idea is simple: filter the light from your phone, monitor and lamps in the evening so your body switches to night mode sooner. Whether that actually improves sleep is disputed, and many health sites are sceptical. They have a point, because the evidence is mixed. This article goes through the key trials and three reviews one by one, including those that found nothing.
You will see what is well established about light and melatonin, where the evidence for better sleep gets thin, and how to use a pair if you want to try it.
In this article you will find out:
- why blue light in the evening matters for sleep at all
- what individual trials with blue light glasses measured, positive and negative
- what three reviews conclude, and why they disagree
- how to use a pair if you want to test it yourself
We sell blue light glasses ourselves. That is exactly why we present the studies as they are, including the ones that found no effect. For practical routines, see our articles on late-night gaming and better sleep and on choosing red or orange lenses.
Why does blue light matter for sleep?
Your body clock is set mainly by light. Besides the cells you see with, your retina contains special light-sensitive ganglion cells that use a pigment called melanopsin. They tell the brain whether it is light outside and help control the release of melatonin, the hormone that rises in the evening and signals night to the body.
These cells do not respond equally to every colour. A 2001 study (Brainard et al.) tested 72 adults to find which wavelength suppresses melatonin most at night. Light between 446 and 477 nanometres, in other words blue light, was the most potent. Red and yellow light have a much weaker effect.
Ordinary room light is enough
A 2019 study (Phillips et al.) of 55 young adults shows how sensitive the system is. On average, around 25 lux was enough to cut melatonin release by half. That is less than a normally lit living room. At 30 lux, melatonin onset came 77 minutes later on average. People also varied hugely: the most sensitive person reacted at 6 lux, the least sensitive only at 350 lux.
What about screens?
Phones, tablets and monitors are just one light source among many, but they sit close to your eyes and often stay on until just before you fall asleep. In a 2015 study (Chang et al.), adults read for several evenings before bed either on a light-emitting e-reader or in a printed book. With the device they fell asleep later, had less melatonin and a delayed body clock, and felt less alert the next morning.
Worth knowing
The link between evening light, melatonin and the body clock is well established. The real question is a different one: can a pair of glasses offset that effect enough for you to sleep measurably better?
What do trials with blue light glasses show?
Here are the key individual studies. Keep an eye on the sample sizes: almost all of them are small.
Melatonin: a clear effect in the lab
A 2006 study (Sasseville et al.) exposed 14 people to bright light for an hour at night. With grey lenses, melatonin fell by 46 per cent; with orange lenses there was no significant change. In 13 teenagers in front of an LED screen (van der Lely et al., 2015), blue blockers also reduced melatonin suppression, and the boys felt less alert before bed. The sleep stages measured in the sleep lab, however, did not change in this study.
Sleep in people with sleep problems
A 2018 randomised trial (Shechter et al.) looked at 14 adults with insomnia symptoms. For one week they wore amber or clear lenses during the 2 hours before bed, then switched to the other pair after a four-week break. With the tinted lenses, scores on an insomnia scale improved and participants reported sleeping longer and better. Measured with a wrist activity monitor, only total sleep time was significantly longer.
Sleep in healthy adults
An older 2009 study (Burkhart and Phelps) had 20 adults wear either amber lenses or yellow lenses that only blocked UV for three hours before bed. After two weeks, the amber group reported clearly better sleep quality and mood. The weaknesses: everything was measured by questionnaire, and the amber group slept worse at the start, so they had more room to improve. The authors themselves called for a replication with objective measures.
Sleep and performance at work
The most widely cited paper appeared in the Journal of Applied Psychology (Guarana et al., 2021), with researchers from Indiana University. In two experiments with 63 managers and 67 call centre staff, participants wore blue-filtering or placebo glasses in the evening and filled in daily questionnaires. With the filter, they reported more and better sleep, higher engagement and better performance. The effect was stronger in night owls. Again, the sleep data were self-reported.
| Study | Participants | Lenses and duration | Result |
|---|---|---|---|
| Sasseville et al., 2006 | 14 adults | orange vs grey, 1 hour of bright light at night | melatonin −46% with grey lenses, no significant drop with orange |
| van der Lely et al., 2015 | 13 teenagers | blockers vs clear, evening LED screen use, 1 week each | less melatonin suppression, sleep stages unchanged |
| Shechter et al., 2018 | 14 adults with insomnia symptoms | amber vs clear, 2 hours before bed, 1 week each | better insomnia scores, objectively only longer sleep time |
| Burkhart and Phelps, 2009 | 20 adults | amber vs yellow, 3 hours before bed, 2 weeks | better sleep by questionnaire, unequal starting points |
| Guarana et al., 2021 | 63 + 67 employees | filter vs placebo, evenings | more and better self-reported sleep, stronger in night owls |
What do systematic reviews say about blue light glasses?
Single studies can come out positive by chance. That is why reviews that pool all available trials matter. And here it gets interesting, because they reach different conclusions.
Cochrane review 2023: very uncertain evidence
The strictest view comes from Cochrane (Singh et al., 2023). The team analysed 17 randomised trials with 5 to 156 participants each. Six trials with 148 people in total looked at sleep: three found an improvement, three found no difference. The authors rated the certainty of the evidence as very low, and none of the trials had a low risk of bias across all areas. For tired eyes at the screen, they found probably no benefit.
Meta-analysis 2020: a small to medium effect
A 2020 meta-analysis (Shechter et al.) pooled twelve studies on tinted lenses worn before sleep. The results were inconsistent. For total sleep time, it found a small to medium effect; for sleep efficiency, a similar-sized effect that could not be reliably distinguished from zero. The clearest benefits were in people with insomnia, bipolar disorder, delayed sleep phase or ADHD, less so in healthy sleepers.
Systematic review 2021: more positive
A 2021 review (Hester et al.) found 29 publications, including 16 randomised trials with 453 patients in total. The authors saw substantial evidence that the lenses shorten the time it takes to fall asleep in people with sleep disorders, jet lag or rotating shifts. Their conclusion is more optimistic than Cochrane's. Unlike Cochrane, they also included non-randomised studies and conference abstracts. How to manage light around shift work in practice is covered in our guide to sleeping after a night shift. For flights across several time zones there is a separate plan covering light, sleep and heavy legs: beating jet lag when travelling.
Evidence check: what is proven and what is not
We have sorted the claims you often read about blue light glasses by the strength of the evidence.
| Claim | Evidence | Our reading |
|---|---|---|
| Evening light holds back melatonin and shifts the body clock | well established | many lab studies, even at normal room lighting |
| Orange or amber lenses reduce this effect | well established | several controlled studies on melatonin |
| Tinted lenses improve sleep in people with sleep problems | partly supported | small positive trials, reviews disagree |
| Tinted lenses improve sleep in healthy people | uncertain | few studies, mostly questionnaires |
| Blue light filters prevent eye strain at the screen | probably not | Cochrane 2023 found no difference |
| Clear filter lenses improve sleep | little evidence | the effects come from studies with strongly tinted lenses |
Why so many guides are sceptical
When health organisations and medical sites say the effect is disputed, they usually have two things in mind. First, glasses sold against tired eyes in the office, often with clear, lightly coated lenses. For that purpose the evidence really is weak. What actually helps tired eyes at a monitor, and why daylight at the office matters, is covered in screen time, blue light and sleep. Second, the small sample sizes in the sleep studies. Both points are fair.
What often gets lost in the debate is how much the lens type matters. According to Cochrane, commercially available blue light lenses filter very different amounts of short-wavelength light depending on the product. The studies that showed effects on melatonin almost all used clearly orange or amber-tinted lenses worn in the evening, not clear office glasses worn all day.
"I see the glasses as a tool for the last part of the evening, not as a fix for poor sleep. If you sit under bright ceiling lights until midnight and go to bed at a different time every night, glasses alone will change little. If you want to make your evenings calmer anyway, they are a simple, concrete step."
How to use blue light glasses sensibly
If you want to try them, base your routine on what was tested in the studies:
- Choose tinted lenses. Orange, amber or red. Clear lenses filter too little for this purpose.
- Get the timing right. In the studies, 2 to 3 hours before bed. Our red glasses for the hours before bed are designed for the last 1–2 hours and filter 100% of blue light according to the manufacturer.
- Be consistent. The glasses only work while you are wearing them. If you check your phone in bed without them, the light reaches your eyes unfiltered again.
- Dim the lights overall. Fewer lux is the foundation. Ceiling light off, warm floor lamp on.
- Get daylight in the morning. Bright morning light is the counterpart that keeps your body clock stable.
- Keep regular sleep times. The same times at weekends often help your rhythm more than any gadget.
For daytime use, such as office work, gaming or streaming in the afternoon, a strong red tint is impractical. That is what the orange blue light glasses for daytime are for: the manufacturer states they filter 99% of blue light, with less colour distortion. If you game a lot, there is a full sleep and neck routine for gamers covering setup, breaks and the evening.
Night mode, dimming or glasses?
The three work together. Night mode on your phone only shifts the colour of a single display. Dimming reduces the amount of light in the whole room, and according to Phillips et al. that matters even in the 10 to 50 lux range. Glasses filter everything that reaches your eyes, including the TV, monitor and lamps. If you change just one thing, start with dimming. If you sit in front of several screens in the evening anyway, glasses are the step that needs the least discipline: put them on and carry on.
Light is not everything: bedroom and recovery
Light is one factor among several. A cool, dark and quiet bedroom matters just as much. During the heating season the air gets dry, which many people find uncomfortable at night. Our tips against dry bedroom air explain how to improve the room climate, and ideal bedroom humidity for sleep gives the target values.
For athletes, sleep is the most important recovery window, as our complete guide to muscle recovery shows. Why sleep matters so much for muscle growth, performance and injury risk is covered in sleep and muscle recovery for athletes. If you want to do something for your legs in the evening as well, a session in recovery boots fits well into a calm wind-down routine. Our guide on how compression boots support recovery explains how it works.
Who blue light glasses suit, and who they do not
A good fit if you
- regularly sit in front of screens in the evening, whether gaming, series or work
- are more of a night owl and find it hard to wind down
- want a simple habit that clearly separates the evening from the day
- work shifts or travel and want to keep your rhythm steady
Not suitable, or not enough, if you
- have been sleeping badly for weeks. Please see your GP; glasses are not a treatment.
- drive in the evening. Strongly tinted lenses are not made for that.
- need accurate colours, for example in photo editing.
- are looking for a fix for tired eyes at the screen. The studies show no benefit for that.
You will find more articles on light, sleep and recovery in our knowledge section on recovery and sleep.
Conclusion
Tinted blue light glasses demonstrably reduce the effect of evening light on melatonin, but whether that makes you sleep better is not reliably proven. The people most likely to benefit are those who get a lot of screen light in the evening, night owls and people with mild trouble falling asleep who combine the glasses with dim lighting and regular sleep times. The studies are small, the reviews disagree, and if sleep problems persist, glasses are no substitute for seeing a doctor.
Frequently asked questions
Do blue light glasses actually help you sleep?
How long before bed should I wear blue light glasses?
Do clear blue light filter lenses help with sleep?
Do blue light glasses prevent eye strain?
Is night mode on my phone as good as glasses?
Can blue light glasses treat insomnia?
Are there any side effects?
Sources
- Singh, S. et al. (2023). Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults. Cochrane Database of Systematic Reviews, 8, CD013244. – Cochrane review of 17 randomised trials
- Shechter, A. et al. (2020). Interventions to reduce short-wavelength (blue) light exposure at night and their effects on sleep: A systematic review and meta-analysis. Sleep Advances, 1(1), zpaa002.
- Hester, L. et al. (2021). Evening wear of blue-blocking glasses for sleep and mood disorders: a systematic review. Chronobiology International, 38(10), 1375–1383.
- Shechter, A. et al. (2018). Blocking nocturnal blue light for insomnia: A randomized controlled trial. Journal of Psychiatric Research, 96, 196–202.
- Burkhart, K. & Phelps, J. R. (2009). Amber lenses to block blue light and improve sleep: a randomized trial. Chronobiology International, 26(8), 1602–1612.
- Guarana, C. L. et al. (2021). The effects of blue-light filtration on sleep and work outcomes. Journal of Applied Psychology, 106(5), 784–796.
- van der Lely, S. et al. (2015). Blue blocker glasses as a countermeasure for alerting effects of evening light-emitting diode screen exposure in male teenagers. Journal of Adolescent Health, 56(1), 113–119.
- Sasseville, A. et al. (2006). Blue blocker glasses impede the capacity of bright light to suppress melatonin production. Journal of Pineal Research, 41(1), 73–78.
- Chang, A.-M. et al. (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. PNAS, 112(4), 1232–1237.
- Phillips, A. J. K. et al. (2019). High sensitivity and interindividual variability in the response of the human circadian system to evening light. PNAS, 116(24), 12019–12024.
- Brainard, G. C. et al. (2001). Action spectrum for melatonin regulation in humans: evidence for a novel circadian photoreceptor. Journal of Neuroscience, 21(16), 6405–6412.
