Don't talk out of your ass: https://justgetflux.com/research.html
I just looked at the newest article in your list ("Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness") and
* there was no mention at all about blue light
* the difference between sleep onset of treatment and control group was 10 minutes - with errors of +-13 and 19 minutes(!), ergo there was no measurable effect.
Edit:
It's important to have a look at the sun's spectrum: https://en.wikipedia.org/wiki/Sunlight#/media/File:Spectrum_...
As can be seen the absolute amount of dark blue to blue (380-500nm) is pretty high regardless of wheather conditions. Full daylight is about 10-20klux, so between 3000lux and 7000lux of blue light alone. For comparison: anti-depression lights are about 2000-3000lux over the whole visible spectrum. Yet people sleep perfectly fine in regions where the sun sets at 11pm in the summer.
There obviously may be an effect, but if it exists, it has to be small.
Those numbers aren't errors--they're standard deviations. The error would be sqrt(N=12), or about 3.5x, smaller, so 3 and 6 minutes, respectively. They also aren't particularly easy to interpret here because it's a crossover design, so the relevant quantity is the change in each subject's sleep onset (or whatever), which is captured by the mixed-effects model, but not the summary statistic.
That said, there are some weird things with the setting: four hours is a lot of reading, and the subjects lived in a fairly dim environment (90 lux) throughout the experiment. Some data (e.g., Chang et al., 2011: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060589/) shows that the range of exposure matters, so this effect might be minuscule in real life, where the noontime sun exposes people to thousands of lux.
The 4h is really unusually high compared to real-life reading in bed. But compared to the other studies its still quite low! One of the other studies had a whopping 6.5h hours of "bedtime reading".
Imagine you fall asleep in 1 minute normally, but take 11 minutes after light exposure. I take 21 minutes, but 31 after light exposure, and a third person goes from 11 to 21. The standard deviation of each condition is the same size as the effect (10 minutes), but there’s still an effect.
> I just looked at the newest article in your list
Why don't you check out the dozens of studies below instead of committing selection bias?
"Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans":
* nothing about blue light
* didn't measure actual effects, just melatonin levels.
"The human circadian system adapts to prior photic history":
* nothing about blue light
* didn't measure actual effects, just melatonin levels.
So zero out of three studies in your link I looked at support the claims. As you posted these studies: Can you point me to a single study from that list that supports your claims?
Of course, that would need to be studied, and would be a more challenging study, but I think you could probably do it.
https://en.wikipedia.org/wiki/Effects_of_blue_light_technolo...
So what do we know? That excessive exposure to any kind of light at night keeps you awake?
It looks like there are several studies on the f.lux page discussing blue light specifically, but fair point that they could be cherry-picking just the studies that support their product.
f.lux and Twilight for Android (inferior but best in class) massively contributed to the reduction of my late night migraines and insomnia.
Try an experiment: code for a few hours late at night with f.lux set to match the white temperature in your room. You can do this by holding up a piece of printing paper next to your screen and matching the color.
After a few hours, change f.lux to the default temperature. Take it as bright as it goes. Then put it back at a temperature which feels comfortable and natural to you. If this is the default color temperature, let me know.
BTW, I can program on my computer with super bright neutral LEDS (my preference) lighting up the room and my monitor set to 90 percent neutral lighting, right until bed time and be asleep in 10 mins. Anecdotal evidence is just that, anecdotal.
* https://en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon
And yes, I'm offering anecdotal data-- but I've already provided the relevant studies so this is just a bonus. In my case, the slightest thing will keep me from sleeping. My A/C was out last night and I got scarcely and hour of sleep because of the heat. I am manic depressive and sometimes I will stay up for days if I don't make extra effort to fall asleep. f.lux particularly made a very noticeable difference to me within days of adopting it.
Edit: See the studies - https://news.ycombinator.com/item?id=21346344