 There's a few things. At the light level, dehydration is a really, really key part of it. Because of the extra strain it puts on the body, when people get to a certain level of dehydration, and it's really at the very early stages, your cognitive function starts to diminish. This becomes really problematic if people are in charge of heavy equipment or making decisions. And this is only when you're only a few percent, very small percent of dehydration.