Slang for pot smoker, usually used by stoners when stoned to hide the fact that they've been 'poking smot'. Often used on facebook status updates by stoners who don't want others to know they're smot pokers.
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.