I'm healthier than I used to be and I live a spartan life. To accommodate my health issues, I have no carpeting, no upholstered furniture, no books or magazines in the house, etc.
These articles consistently vilify modern tech and the kind of light it emits. They seem to never, ever, ever mention modern North American Affluenza as in any way pertinent to the problem space.
I think they are overlooking a very important detail.
I'm sure there are others. That's not everything. But I think it's a large factor that is largely overlooked.
It couldn't be more self-evident: stop doing things and go to bed with enough time to sleep your amount. Anyone can do it any evening.
The challenge isn't how to sleep but how to prioritize your life to avoid distraction from encroaching in that time. That's a matter of examining your life, figuring out your values, and learning to act on them.
If you prioritize other things and sleep less, fine, you prioritize other things and sleep less, but don't say the way to a good night's sleep is hard if you chose not to turn off your computer.
Gary Taubes in some interview gave the example (from memory) "The simple, self evident way to make a restaurant popular, is to get people to eat there". And it's true!