I have serious sleep issues, and I can't adequately describe how absolutely dead I feel every day, and how sluggish my mind is for the first hour or so after I wake up. Monster Energy (specifically the juices, or any of them that also have sugar) changes how I feel and how alert my mind is in a way that no other caffeinated drink does - not coffee, not Red Bull, not anything. Not sure what it has that's different from other energy drinks, but it definitely affects me differently.