Two words which have been fused together to form one. Most often the result of taking the first concenent or syllable of the first word, and replacing the first concenent or syllable of the second word.
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.