Yes, my phone and my laptop both have that option.
Never, I tried it a few times but it never seemed to help me with sleeping or anything.
No, I didn’t know they exist 
@Discussions Do you use the night light mode?
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I use night mode on my phone only. Though my phone and computer both use dark mode as well them both generally using low brightness.
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My mom hates it… she says the screen is too dim
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