I have a much loved friend that frequently calls me on her way to work to set up lunch. She knows I have trouble sleeping and frequently fall asleep in the wee hours. After one last call before 7am ( the first words out of her mouth being "did I wake you". Followed by "well you can go right back to sleep".)I decided our frienship would not survive my not scheduling Do No Disturb from Midnight until 9am. I instructed those who might need to call me in an emergency how they can get thru. After midnight I get no calls, texts, emails or any notifications.