Saying for jerks, slackers, cocky bastards, arrogant pricks and very highly respected douchebags meaning you are the one cutting the slack, and nobody else. There isn't anyone else in your life that you need to ask for help, because you know how to help yourself, and don't need anyone's permission.
"Cut me some slack, Jack! Sorry, I cut my own slack"
"Did your boss cut you some slack on your lunch so you can stay longer? I am the boss, I cut my own slack!"
Either liquid niquil or any liquid drink with melatonin, Ashwaganda or other sleeping aids in a liquid form. If warm tea helps you get to sleep that could be sleepy juice too.
I could not sleep so I chugged some sleepy juice and now I'm so tired and sleepy.