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I hate the phrase "screen time". Why does the fact that there's a screen involved matter so much? Many "screen time" activities are more closely related to non-"screen time" activities than to other "screen time" activities.

If the kids is typing a report instead of handwriting it, or reading an ebook instead of a physical one, why does that count as "screen time" along with flappy bird?

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Blue light produced by screens is harmful and effects sleep pattern.

Do you have any sources for that? Not being negative here, but last time I checked it was mostly in the realm of hypothesis and broscience.

This sounds like a source. http://www.gwern.net/docs/melatonin/2009-burkhart.pdf

But it seems to be very subjective. And the group that started limiting blue-light before sleep seems to have percieved their sleep quality as quite low, so the improvement might be only correlated?

Both iOS and Android have timed night mode features to lower the colour temperature... or at least apps to do that if not using a recent OS.

I'm not convinced it's much of an issue these days.

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