Word of affection used between lovers. May also be used sarcastically as a put down, similar to the word hun
"Aw, shnukums, you shoudn't have gotten me something so expensive for my birthday, I love you!"
"Listen Shnukums, you let me do the thinking around here, got it?"
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.