Written by the Nuvirox Research Team
Key points
- The statistic behind nearly every 'best bedroom colours' article — blue rooms averaging 7 hours 52 minutes, purple rooms 5 hours 56 — comes from a UK hotel chain's marketing survey of 2,000 people, not from a peer-reviewed study.
- No controlled trial has shown that wall colour changes measured sleep. A sleep physician quoted in 2026 described the existing research on colour and sleep as speculation.
- The bedroom variables with real evidence behind them are light, temperature, noise and schedule. Those are measurable, and they are what a redecorating budget is better spent on.
Short answer: almost certainly not much, and the famous statistic is a hotel marketing survey. This is one of the clearest examples in the whole sleep-advice landscape of a claim that has been recirculated until it acquired the texture of established fact. Trace the numbers back and they end at a promotional survey commissioned by a budget hotel chain. That does not make the underlying idea absurd — colour genuinely affects mood, and mood affects how easily you settle — but the gap between 'colour affects mood' and 'paint your bedroom blue to sleep 7 hours 52 minutes' is enormous, and almost nobody repeating the advice acknowledges it.
Where does the blue bedroom claim come from?
A Travelodge survey of 2,000 UK adults. It reported that people with blue bedrooms averaged 7 hours 52 minutes of sleep, the longest of any colour group, with purple bedrooms at the bottom at 5 hours 56 minutes. The same survey produced findings about which occupations prefer which colours and which room colours correlated with shopping online in bed, which gives a reasonable indication of the genre.
It is not a scientific study. It was not peer-reviewed, the methodology has never been published in retrievable detail, sleep duration was self-reported, and there was no attempt to control for the obvious confounders. That last point is the fatal one. People who paint a bedroom a calm, deliberate colour are people who have thought about their bedroom — they are likelier to have blackout curtains, a consistent bedtime, and a room used mainly for sleeping. Any of those would produce the observed difference with colour playing no causal role at all.
What the actual research does and doesn't show
There is colour psychology research, and it is about mood, not sleep. Studies on colour and emotional response are real. Cool, desaturated colours are generally associated with lower arousal and calmer self-reported states; saturated warm colours with higher arousal. That is a genuine finding and it is where the sleep advice ultimately borrows its plausibility.
But nobody has connected that to measured sleep. A 2018 Italian study of students living in residence halls over thirteen months found blue was the most preferred interior colour, followed by green, violet, orange, yellow and red. It measured preference. It did not identify room colour as a factor influencing sleep quality, and it is regularly miscited as though it had.
A sleep physician's objection is worth stating plainly. Dr Charles Samuels, medical director of the Centre for Sleep & Human Performance in Calgary, told the Calgary Journal in February 2026 that existing research on colour and sleep is speculation, and made the structural point that these theories are hard to test because during sleep the eyes are closed and the lights are off. He acknowledged that studies have examined emotional responses to room colour but cautioned that those findings cannot be extended to improved sleep.
The honest counterweight to our own scepticism: the eyes-closed argument is not quite decisive. You spend time in your bedroom awake — undressing, reading, winding down — and if the room's colour genuinely changes your arousal state during that window, it could in principle affect sleep onset. That is a coherent hypothesis. It has simply never been tested with actual sleep measurement, which is the point.
What actually is worth changing in a bedroom
Light, first and by a distance. The contrast between bright days and dark nights is the primary signal your circadian system uses, and most bedrooms fail at the night end. Street lighting through thin curtains has a measurable effect — see light pollution and sleep — and the daytime side matters just as much, covered in whether sunlight through a window counts.
Temperature second. The body needs to shed heat to fall asleep and stay asleep, and bedding creates a microclimate that often runs considerably warmer than the room. Both cooling mattress pads and simple thermostat changes act on this directly.
Noise third, with the caveat that novelty matters as much as volume. And the door, which turns out to have a much larger consequence than any decorating decision — see whether to sleep with your bedroom door closed.
What colour won't do
It will not compensate for any of the above. A beautifully painted room with a streetlight shining into it and a thermostat set to 23°C is a worse sleep environment than an ugly one that is dark and cool.
It will not treat insomnia. If you have been sleeping badly for more than three months, the intervention with the strongest evidence is cognitive behavioural therapy for insomnia, and no environmental change substitutes for it.
And it will not make a room that is used for work into a room that signals sleep. The stimulus-control side of sleep — what your brain associates the bed with — is far better evidenced than the aesthetic side, and it is about behaviour rather than paint.
Frequently asked questions
So should I not bother painting my bedroom?
Paint it whatever you like. If a room you find calming makes you more inclined to spend the last hour of your evening in it rather than on the sofa with a screen, that is a genuine indirect benefit — it just runs through your behaviour rather than through the wavelength of the wall. What we would push back on is spending money on repainting specifically as a sleep intervention when the same budget on blackout blinds has actual evidence behind it.
What about the colour of light rather than paint?
That is a completely different question with a real evidence base. Light intensity and spectrum genuinely affect melatonin timing, with short-wavelength blue light around 460–495nm being the most potent for circadian signalling. Dim, warm light in the evening is well-supported. That is about light sources, not surfaces.
Does a dark bedroom mean dark walls?
No, and conflating these is a common error. Darkness means absence of light, which is a function of your window coverings and light sources. Dark walls in a room with a streetlight outside will still be a bright room. Light walls in a properly blacked-out room will be pitch dark.
Is there any colour I should actively avoid?
Nothing supported by sleep data. If you find a colour agitating, that is a reasonable personal basis for avoiding it in a room you want to relax in — but that is preference, not physiology, and it does not need a study to justify it.
From Nuvirox
Why we formulated Sleep+ Restore
We would rather tell you that a widely repeated claim is thin than sell around it. Bedroom colour is not a sleep intervention, and a supplement is not a substitute for the ones that are.
Sleep+ Restore is built for the wind-down end of an evening routine, for people who have the light, temperature and schedule side in reasonable shape and want something for the last part of the day.
Backed by a 60-day money-back guarantee — long enough to actually evaluate it the way the research says you should.
Learn more about Sleep+ Restore →The bottom line
The bedroom colour advice that circulates everywhere traces back to a hotel chain's promotional survey, and no controlled research has connected wall colour to measured sleep. The underlying premise — that colour affects mood and mood affects settling — is not unreasonable, and we are not claiming it has been disproved. It simply has not been tested, and the confidence with which the specific numbers get repeated is unearned. The variables that genuinely move sleep in a bedroom are light, temperature, noise and what you do in the room, all of which are measurable and all of which are cheaper to change than a paint job. Choose colours you like. Just do not file it under sleep hygiene.
References
- Travelodge (UK hotel chain) consumer survey of 2,000 UK adults on bedroom colour and self-reported sleep duration. Marketing survey, not peer-reviewed; widely recirculated without methodological detail.
- Samuels C (Centre for Sleep & Human Performance), interviewed in: Fact-checking claims that painting your bedroom walls will help you sleep better. Calgary Journal. 13 February 2026.
- National Toxicology Program. Circadian regulation and disruption, night shift, and light at night: characterization and exposure. NTP Cancer Hazard Assessment Report on Night Shift Work and Light at Night. NCBI Bookshelf NBK571591.
- Residential dusk and dawn light exposure for sleep quality, health and well-being (review). Sleep Medicine Reviews. 2023;72:101828. doi:10.1016/j.smrv.2023.101828.
- Roth T, Mayleben D, Feldman N, Lankford A, Grant T, Nofzinger E. A novel forehead temperature-regulating device for insomnia: a randomized clinical trial. Sleep. 2018;41(5):zsy045. doi:10.1093/sleep/zsy045. PMID: 29648642.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.