alt Hacker NewsDid you read the article? He points out “It’s possible that Night Shift does something, but the biggest study I could find of Night Shift mode (still a pretty small study) found little effect on sleep, so if there’s an effect, it must be tiny.” He links the exact type of observational study you asked for
Regardless the maximum possible effect will be constrained by the biology of the cells responsible for responding to blue light. Maybe knowledge of the biology is incomplete or flawed but to not use it to inform what’s possible seems foolish.
So what if it’s a placebo effect? Well some people are spending money and time investing in blue light filtering glasses and other solutions. It’s potentially snake oil and it could keep them from pursuing better solutions that would actually help them sleep
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That sentence does not give me a lot of confidence. The conclusion does not follow the initial statement at all.
If the author goes "I couldn't find enough high quality studies on the topic I'm discussing", then the conclusion should be that we need more studies, not to come to unwarranted conclusions in the absence of actual data.
> Well some people are spending money and time investing in blue light filtering glasses and other solutions.
Ironically, we actually do have a number of good studies on the effects of blue light filtering glasses (easily findable with a Google search) and they do demonstrably reduce onset of sleep time. Where more research is needed is on software-only filters for screens.