This article refers to "moderate" (100 lx) light exposure - this amounts to an overhead light on in the room for the entire duration of sleep.
I would say an overhead light is a significant amount of light, but wonder how low the threshold is for sleep disruptions. Living in an urban environment, there's a non-negligible amount of ambient light that makes its way in. I don't use a set of blackout curtains, but I know several friends that say it makes a real difference.
> I don't use a set of blackout curtains, but I know several friends that say it makes a real difference.
Maybe a year ago, I was planning on having a sleep study done. At some point in my 30s I stopped feeling like I was recovering when I slept. I decided, however, that there were some things that I could work on improving before having a sleep study.
Most of what I addressed falls under sleep hygiene: Blackout curtains, better sheets, better blanket/comforter, better pillows, a better mattress, a sleep mask, reducing noise. It took a while to sort all of this out. "Better" is also subjective.
I also slowly worked on getting to bed earlier. I used to get into bed around 11:30pm. Now I'm in bed between 9:30 and 10pm. I read a little bit and then sleep. I stopped having calories after ~7pm.
We have young children, too. 3 under 3. I sleep very well now. Despite the regular interruptions I actually feel like I am getting the highest quality sleep of my adult life right now.
The blackout curtains, though... The difference they made from one day to the next was immediately obvious. My wife and I both woke up feeling more refreshed, looked at each other and said, "Why did we wait so long to do this?"
Blackout curtains are great for sleeping, but I have trouble waking up and getting out of bed when the room is still completely dark (when it’s light outside in the AM).
Recently bought some Hue smart lights to simulate sunrise with blackout curtains which is helping. Next up, motorized blinds that open at a scheduled time.
Here in Germany they have metal shutters that vertically descend and black out all light and sound. It’s common on most windows.
They are permeated with little holes that allows light and sound in if they have not fully descended. If they have then the little holes are folded shut.
I’ve found the same issue where if they’re completely down waking up is hard, so I leave the top two rows of holes open to let in natural light.
I think having a small amount of light gradually filtering in helps a bunch to wake-up.
I just moved to a new flat and, by design, the motorized shutters don't close fully and the top two or three rows of "holes" remain exposed when the motor disengages.
I was a bit annoyed at first and considered tweaking the mechanism to close the shutters fully, but in the meantime the impact this tiny changes has made on my and my girfriend's sleep patterns is tremendous and now I think I'll leave it that way.
We used to be very late sleepers, I work from home and regularly wouldn't wake up until 11AM or so. Now at 8:30 sharp I'm awake and ready to get up. It's a pleasant way of waking up too, I can tell that my body is sort of meant to be woken up that way instead of using an alarm sound. Obviously it also means that I get tired much earlier at night. But overall it seems like a positive change, especially since I'm in my mid-thirties and it's not like I regularly party all night anymore and I appreciate getting more time to do stuff in the morning.
You Germans have them too? Good! In Spain we have used them since forever, but it seems that most countries have yet to discover their wonders. They are one the things I miss the most when living abroad or traveling around.
I'm living in Germany and my wife really likes shutting them fully. That really makes it hard for me to wake up. I wish I could automate them. 2 problems: We don't own the flat we are living in and I wouldn't even know where to start hacking these fully closed electronic systems.
I live in France and we have the same shutters (metal plates rolling vertically with th esmall holes that can be uncovered).
I automate what I can at home - the CHO (Chief Home Officer - my wife) mostly disapproves because of some weird concerns about reliability (70% of availability for lights is that I call great, but opinions vary).
There is a simple solution for the shutters - you can use a Shelly 2.5 (https://shelly.cloud/products/shelly-25-smart-home-automatio...) that you connect in parallel to the shutter. It works wonders if you have a manual switch on the wall and probably with a remote too (I specifically asked for a manual switch on the wall). You can program the device itself to open the shutters at, say, 10 minutes before sunrise or whatever. You can easily remove them when you leave your flat and reuse somewhere else.
The Real Solution For Real Hackers (c) is to use Home Assistant (https://www.home-assistant.io/). <flamewar on> Do not settle for inferior systems such as jeedom, domoticz, ... </flame war off please do not hunt me>
> and I wouldn't even know where to start hacking these fully closed electronic systems.
If you have electronic shutters, most of these are a simple 230V based system: one neutral line and two 230V inputs, one for each direction. Hacking them is easy, get two programmable 230V relays (e.g. use a Raspberry Pi relay board) and never ever activate both relays at the same time.
> They are permeated with little holes that allows light and sound in if they have not fully descended. If they have then the little holes are folded shut.
This too is a bit generalised, as ours do fully close. In fact they actually snap into place to activate a break in barrier. This makes it harder to break in, as they can not be easily pushed up or removed.
Rolladen? Yes, I remember those! My wife and I lived in Belgium at the time, but we visited her sister and brother-in-law in Germany on a few occasions.
Yes, I want! Have wanted for years, in fact. Hard to get here in the US, however.
Same here in Greece. I have no idea how people sleep without them, visiting the UK or US is always frustrating because I have to wake up at the crack of dawn.
I live in the arctic, and black out curtains in the summer is a must have (as it's daylight 24/7 for a month).
And around december it's dark 24/7, so a sunrise lamp helps a lot to wake up naturally and not feel like total crap every morning.
Living in Seattle, having lights that turn on in the morning really help wake me up in the winter months. I use an Alexa routine which turns on NPR and turns the nightstand lights to ~50% so they’re providing light but not harshly so.
I've always wondered why both "sunrise lamps" (like the one you're referring to) and "light-therapy lamps" (i.e. lamps of 10000+lm with a diffuser) exist, but there are no sunrise light-therapy lamps, which 1. go from dim to holy-wow-that's-bright on a slow timer, and 2. which are designed in a shape where you could fit them around your bed somehow. (IMHO, they'd ideally be a flat ceiling panel!)
Accidentally set up android's new gradually lit screen alarm, and it really made waking up quite nicer. The kind of "oh wow, so simple yet so nice" feeling when it happens.
I got SwitchBot Curtain for a simple DYI motorized curtains project. Affordable and trivial to install. I let the light in 10 minutes before the alarm. Should've got it sooner.
My wife was complaining about waking up in the middle of the night. I grabbed some black out curtains. She woke up the next day feeling better than she has for a long time.
Turns out there was a streetlight that would hit her in the face and was causing her to wake up. We didn't realize it until we got the blackout curtains.
Not OP, but had the same experience several years ago. The answer is yes.
If you want a cheap test, you can tape aluminum foil over your bedroom window(s) for a night (learned this from The Martian!). It will fully block all light, and you probably already have what you need to try it in your home. Note that it does have the downside that from the outside you look like a crazy person.
I also use this trick when traveling - some AirBnBs have crazy thin curtains.
Huh, that's kind of wild. I'd assumed that blocking all light out at your eyes would do the same trick, I'll have to try the blackout curtains. Thanks!
Your face structure may be different than mine but I found this sleep mask stays put and works well at blocking out the light — https://www.amazon.com/gp/aw/d/B07D3M5TTZ
Yes, definitely, but I continue to use the mask. There are times when I need the mask, because I'm napping or sleeping some place that isn't blacked out, and if I haven't worn it in a while it is very bothersome / distracting.
> I don't use a set of blackout curtains, but I know several friends that say it makes a real difference.
Have blackout blinds on every window upstairs so thats its dark enough during summer mid day sun to sleep. They keep the heat out during the summer (to the point I dont need the air conditioning on albeit on the hottest days and the warmth in during the winter which contributes to energy saving, the only downside is the air gets stagnant in small buildings.
I believe a lot of German homes also have external blinds over their windows for similar reasons plus they offer a layer of security making it harder to break in, but then what do the Germans know?
100lux is quite bright, I have a lux meter and here in the UK 100-200lux is a really cloudy winters day level of brightness, where as a bright summertime day will exceed tens of thousands lux for comparison.
Its because light affects the release of melatonin black out blinds are fitted. Melatonin increases the release of stem cells and stem cells play their part in repairing the body, but like I say earlier, CO2 levels building up cause the body to be stimulated even during sleep so sleep is not as refreshing as it could be in small homes and almost all UK homes are small, but hey the CO2 helps contribute to an increase in GDP and thats all that counts!
I don’t live in an area with a lot of light pollution but have black out curtains for full moons and that hour or two after sunrise before I’m awake and they have made a noticeable difference.
> Living in an urban environment, there's a non-negligible amount of ambient light that makes its way in. I don't use a set of blackout curtains, but I know several friends that say it makes a real difference.
God bless Europeans and their cutting edge roll shutter technology, I can sleep in total darkness despite the street lamp 10m away from my bedroom window. And ye[, it definitely makes a difference.
Not true that there is any sort of official rule to this effect. I've slept in a lot of crew hotels that had only semi-decent curtains.
It is true that well-behaved airlines, who take an active interest in fatigue prevention, do try to book hotel rooms with blackout curtains and good sound proofing. This is however not a universal behaviour and not all destinations where layover is necessary have any hotels with these qualities.
In searching to attempt to find corroboration for this factoid, literally the only things mentioning pilots and blackout curtains I could find were your own comment here and a random forum post from a pilot saying blackout curtains don't really work. Nothing about any requirement that pilots only be placed in hotel rooms with blackout curtains.
The research discusses 100 lux for one whole night, which is quite a lot (indoor levels range from 100 to 1000 lux, outdoors from 10k on a cloudy day to 120k with direct sunlight at noon.) Like others here, I’m curious about other strengths of light - I assume up to 0.1 lux is fine, as moonlight is typically 0.05-0.1 lux, but what about between 0.1 and 100 lux? And what about light exposure during part of the sleep cycle? There’s quite a lot of sleep research, much of it poor quality, so I’d be grateful for any specific study suggestions.
I noticed that on nights the full moon was shining though the regular curtains on my bedroom window I would get a horrible nights sleep. It wasn't fixed until I got blackout curtains.
One night? You could probably repeat this experiment with fart stench or any other obnoxious irregularity and find impairment of glucose tolerance at a decent p value.
I see the headlines now: "Fart stink during sleep impairs cardiometabolic function." So yeah, guess the wife is getting diabetes if I don't move to the dog house.
Joking (?) aside, cheapish air purifier are reasonably efficient to help for stinks and other air issues during sleep if they have a carbon filter (IKEA ones have the option for instance). Bonus point if they can auto-adjust power depending on the air status, but I don't think that's mandatory.
I agree -- our bedroom is small and benefits from even a simple filter! However, my point was to humurously criticize the study title for sounding too conclusive. The study is useful as a starting point but it is pretty well known in such literature that one-night of introducing variable X can yield results showing negative short-term perturbations. X can even be something generally regarded as positive such as first night on low-stress vacation, or even the first few times people share a room with a partner. Changing a routine increases vigilance (not sure of proper technical vernacular for that, but you get the idea).
> When people spend a couple of nights in a specialist sleep clinic to check for sleep disorders, sleep experts have long known they can’t always rely on the first night’s data.
I use electrical tape to cover those and it's made a world of difference, it's crazy how many items have LEDs in them. Power strips, clocks, monitors, charger cables, my synth, ... My girlfriend thinks I'm nuts because I'll get up in the middle of the night to tape over previously undiscovered LEDs.
Oh my those are some fun images! The art on a lot of Amazon listings are just hillarious. Some are down right creepy. The 6th image for this listing has a very intersting bit of text on the screen in what I'm guessing a slide in a deck??? My favorites are the ones where the "product" is just photoshopped in with Escher level physics required to make it believable.
If only I had more time, I'd love to gather up these images with these fake words and create a dictionary. I know that there are thesewordsdonotexist type of sites, but this seems different. Luckily, I have no free time to find myself down that particular rabbit hole.
It reminds me of this article [0], a very interesting read on "surviving" winter in Sweden (and Northern latitudes in general). It ends with how in summer things are flipped and everyone complains about how poorly they sleep.
Yes, the article resonated with me because I lived in Berlin for 4 years. When your child wakes up at 4 am and the sky is bright blue outside, it's impossible to put them back to bed!
I live in the north part of the north hemisphere. It's bright outside the entire 24 hours for almost a month during summer. I use a sleep mask to combat it and the last 5 years I feel like I regained sleep during the summertime. Last year I purchased a Manta Sleep mask and they are next-level good. Total darkness and really easy on the face. I have no affiliation with the brand, just a really happy customer of theirs.
In the summer if I don’t sleep with my mask off I start to feel myself slowly unhinging. Sun being out at 2am while you’re trying to sleep can definitely make you feel out of it! Hard to find blackout curtains that work perfectly too.
Could this effect be explained otherwise by "disruption of normal sleeping environment"? Presumably all of these people are used to sleeping with dim lights. What would the effect be on subjects who were used to 100 lux light?
My intuitive sense is that light at night has some harmful effect. On the other hand, I live at a latitude where summer nights are very bright, and I and my fellow residents generally get used to it. Perhaps the effect diminishes?
Are there people with sleeping habits such that they would find darkness similarly disruptive?
At one of the jails I was in the deps would put the dayroom TV on at full volume all night long when they were pissed at us. between that, no pillows, and 3:45 AM breakfast, sleep hygiene isn't terribly valued in county
That would be nice. Proper nutrition would be great, too.
The Effects of Vitamin-Mineral Supplements on Serious Rule Violations in Correctional Facilities for Young Adult Male Inmates: A Randomized Controlled Trial
You - as a patient - often have time to sleep unlike in your daily life. And the hospital is often going to wake you up nonetheless: It is, generally, more important to take your vitals than it is to allow you uninterrupted sleep.
They also need to look out for safety. You have a bunch of patients who are feeling poorly. Some aren't quite sober due to pain medications. All in an unfamiliar setting. A bit of light makes it safer to move around at night if you should need to. Sure, a patient can control lights, but not everyone will be able to. In some areas, you are sharing a room, too.
All that said: For my last hospital stay, the room got as dark as I wanted at night - but I'm not sure that would have been the same during the summer (I can read outside at night during the summer).
Hospitals are really there for downside mitigation and acute care, not necessarily for “recovery”. If you take that perspective, it makes a lot more sense why the lights, beeps, vital checks, loud talking in the hallway, etc all conspire to ruin your sleep. Ultimately, getting healthy enough to be discharged and getting back home is when/how you’ll fully heal.
Source: Spent a few nights in hospital a week ago and came home covered in bruises and sleep deprived —- but very alive and ready to recover!
I always bring a sleep mask and ear plugs with me to the hospital. It confuses me that they don't hand them out! Sleep is essential for healing. I have often had nurses in hospitals tell me to sleep, but I've never had a nurse offer me ear plugs.
> Melanopsin photoreceptors are sensitive to a range of wavelengths and reach peak light absorption at blue light wavelengths around 480 nanometers.[30] Other wavelengths of light activate the melanopsin signaling system with decreasing efficiency as they move away from the optimum 480 nm. For example, shorter wavelengths around 445 nm (closer to violet in the visible spectrum) are half as effective for melanopsin photoreceptor stimulation as light at 480 nm.[30]
Under Melanopsin > infobox > "Biological process", e.g. "entrainment of circadian clock by photoperiod" and "regulation of circadian rhythm" are listed.
There was a time when it seemed like every new device had to have an always-on blue LED. Escaping blue light at night was an effort. These days small white LEDs are in fashion, which I find much more tolerable.
A big of black gaffers tape takes care of that for me. Electrical tape in a pinch. If I use white gaffers tape, it significantly cuts the light but is still visible when I'm looking right at it.
You can buy some self-adhesive light attenuating film. They sell it in pre-cut shapes, in black (several strengths), white and silver. The name brand that started it all was, "LightDims".
I put them on... most things. Network gear LEDs. Power LEDs. All manner of things.
When I was a student I slept with everything I owned in a single room. I had to block light from the Ethernet port status lights on my computer and printer, the smoke alarm, and my phone charger.
These days I own a home with far more space. The things which have LEDs are not in my bedroom.
As a generic statement, look for a silk sleep mask.
While not often actually silk, they tend to be soft polyester and use fabric filler rather than near-credit-card-grade plastic. (I agree, I don't understand firm sleep-masks)
In the photos (I know they're photoshopped these days), look for the mask to actually wrap around the user's face, and look for photos that show the same material on both sides (so you can see that you're not getting a different material on the user's face-side). Look for a bit of gloss to the material so that it appears to be a nice silk-or-polyester. Look for the little plastic clip of an adjustable elastic loop so you can adjust the tension.
I definitely have had to play with the elastic tension to get a soft fit.
I have heard that, since polyester is carcinogenic, it’s unwise to have things in your bed or near your face for long periods of time that are made mostly of polyester. I would be a little concerned about a sleep mask sitting on my eyes and near my nose and mouth for 1/3 of my life.
This definitely qualifies as one of those things I often wonder "what were they smoking when the thought of this, and where can I get some?". I'd love to be a fly on the wall in pitch meetings or see The Sharks be pitched this. However, I love that you can just wake up in your nitehood, adjust to be on the on the go, and one more adjustment to rob the stage coach or money train with your gang of outlaws.
I've had three in that time due to accidentally leaving it in hotel rooms.
A test of a good mask is if you can see any difference with your eyes open or closed, and if you can feel your eyelashes touch anything if you open and close them. These are excellent and have a satin outer which slides around the pillow rather than coming off or moving.
They include ear pads to block out sound, but I find them a bit uncomfortable and never use them.
I remember several twitter threads about this and the clear winner was usually the Manta Sleep Mask. Doesn't push your eyeballs in, plus the eye parts are velcro-attached to the strap so you can adjust them to your face.
+1 to this one - I use it too. It really helps if you use blackout curtains in addition to it. Add in earplugs and some white noise source (I use a fan) and you can solve a large portion of your sight/noise problems at night.
I find that the pressure on my head over the course of a night, even with the fairly loose mask, is very uncomfortable and disrupts my sleep even more than the lights.
I have RGB memory that is really bright and light the whole room when lights are off. It was cheaper than a similar non-RGB when I purchased. Guess I will put same electric tape on it as I already did with everything else.
I love studies like this. I know, I know. "It's just a study." But it means that people are having new thoughts about how the body responds to its environment and enters into chronic disease states.
Some of our "new ideas" about diseases are actually maybe not all that crazy [1].
Every time I see one of these potential connections, my brain jumps to generate new hypotheses for everything around it. I sometimes wish I was a PI looking into these things.
For instance, this article made me think that perhaps children being exposed to night lights upsets their metabolic behavior in early development enough to lead to long term neurotransmitter dysfunction and desensitization. ADHD. Just a hypothesis. Totally unsupported. Probably not a contributor. But I'd love to have access to journals and data and test these things.
Recently I started to only work in daylight times, I had to shift my sleep 3-4 hours sooner. The idea is to never need to use artificial lights, wouldn't work well in high latitudes winters though :))
What worries me is that some of the research done on this suggests that even tiny amounts of light could have a noticable effect, like green and blue LEDs on common home electronics when it sits in standby or sleep mode.
I would say an overhead light is a significant amount of light, but wonder how low the threshold is for sleep disruptions. Living in an urban environment, there's a non-negligible amount of ambient light that makes its way in. I don't use a set of blackout curtains, but I know several friends that say it makes a real difference.