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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.
Most phones these days allow you to set a DND schedule which you can customize to allow specific numbers for emergencies and people that don't abuse it.
Mine has a setting where if a number calls you once, it blocks. If it calls you a second time, it goes through. And it works! I use it all the time.
Well yeah, but the problem is typically the people who you don't want you calling you in the middle of night are also the ones willing to call you a few times till you pick up.