I don't know about you, but I feel compelled to look at my phone every time it dings, vibrates, or lights up. If you add up all the times you stop what you're doing to look at your phone, that adds up to a lot of time where you're distracted and unproductive. I use the do not disturb setting on my phone during the night so it doesn't wake me. It's also useful to use it during other times when it's best not to be disturbed. You can still allow notifications and calls from certain apps and people so you won't be completely cut off from the rest of the world.