The title sounds like a SciFi horror movie doesn't it? In truth, the idea is a bit scary. Here is the introduction to an article titled, Your Brain On: Dehydration:
Call it “dry brain.” The moment your noodle feels even mildly parched, a bunch of its most important functions tend to go haywire. From the way you feel to the power your mind has to process info and memories, dehydration does immediate damage to your mental abilities. It even shrinks your brain, research shows. [read more here]I have a tendency to forget to drink water. The author says that if you feel thirsty, you’ve already waited too long to drink some water. Ouch. He gives us a few hints about how to know if we are getting dehydrated. Read the article and please, do not stay thirsty my friend.