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Smartphones May Affect Sleep—but Not Because of Blue Light
(www.wired.com)
This is a most excellent place for technology news and articles.
I set my phone to automatically go into Do Not Disturb mode at night, but still ring if my parents call me. If they call at night, it must be urgent.
That seems like a perfectly reasonable thing to do, very different from allowing "notifications and messages to disrupt their sleep".