These existing questions ask whether the blue lights, not blue light filters, from computer screens affect sleep:

My question is if blue light filters, not blue lights, have been shown to make sleep harder, and not just having any impact, contrary to its intention to make sleep easier.

A 9to5Google article says:

The University of Manchester published a study (via the Guardian) that found blue light filters may actually trick our brains into thinking it’s daytime, exactly the thing they were designed to avoid.

AndroidAuthority also reports the story, and mentions the study was done on mice.

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    A discussion about what constitutes a "blue light filter" has been moved to chat, as it's no longer necessary (OP clarified the question).
    – tim
    Commented Aug 7, 2020 at 6:45

1 Answer 1


This is the study itself if you want to read it. Yes it is a study in mice. It is evidence but not proof that blue filters are counter-productive, at least according to the authors of this single, peer-reviewed study. This is a fairly typical example of media fixating on a single study and making it out to a bigger deal than it actually is. More research is needed.

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    @BCLC I'd only say yes if there are other studies showing that these filters are effective, but I've not really looked in to that and don't know if that's the case.
    – Brian Z
    Commented Aug 3, 2020 at 18:00
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    Note that this study compares light of equal intensity. At least when I use the blue light filter on my Android device, I use it to lower the screen brightness by (partially) cutting out 2/3 of the light emitting pixels (i.e. the ones not red). This is useful because in a completely dark room, the minimum brightness is still brighter than necessary.
    – Nobody
    Commented Aug 4, 2020 at 11:37
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    @BCLC You're right - I'd misread in this case. My brain seems to have missed out the word 'filter' from everything and believe we were talking about the blue light itself. Commented Aug 5, 2020 at 8:15
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    Hmm, apparently, Sci-Hub somehow breaks the usual public opinion (that I met online) of copyright infringement as bad: see e.g. here. As for SE policy, it appears to be OK: see this discussion.
    – Ruslan
    Commented Aug 5, 2020 at 13:05
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    OP: Besides the fact that light intensity would be a parameter, it is quite reasonable that our eyes and brain react to the same light in the sane way. If the spectra of the impinging light would be similar, the effect they may have would be certainly the same.
    – Alchimista
    Commented Aug 19, 2020 at 19:03

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