For those like me that don't know the difference between probiotic and prebiotic:<p>Probiotics are “good” bacteria that help keep your digestive system healthy by controlling growth of harmful bacteria. Prebiotics are carbohydrates that cannot be digested by the human body. They are food for probiotics. ... It has good bacteria like lactobacillus or bifidobacteria.<p>TLDR: mice that ate prebiotics had better REM sleep.