- The Alpe feeds on melatonin, and targets heavy sleepers who produce a lot of it. The Grimm Gang use this information to dose Munroe with melatonin to ensure he's the one targeted. Okay. But no one explains why the Alpe doesn't just use melatonin supplements themselves to avoid feeding on anyone (even to the extent of, "They just don't want to.")
http://tvtropes.org/pmwiki/pmwiki.php/Headscratchers/GrimmS6E6BreakfastInBed
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