[pound]

re 'answering work emails until midnight: REALLY BAD' - true for any screen time. Night shift/f.lux or glasses with a blue light filter may help a little with that

[mk89]

I don't understand why you got down voted. I use also a blue light filter, and it helps. Of course, if you look up stuff until 2AM...there is no device helping you there, except for a battery off! :)

[saagarjha]

I use Night Shift on all of my devices, and let me tell you, it doesn't help me get to bed any earlier.

[pound]

it's not supposed to get you to bed earlier, it's to fall asleep easier once you'll get to bed.

[slothtrop]

It's to help reduce suppression of melatonin production, which can be up to 50%.