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1.
Often used to describe when a cat gets extremely hyper and wacky. Their pupils get extremely large and sometimes evil. It is comparable to someone who is on crack. This usually occurs after twilight.
Karen: Your cat is psycho.

Erin: Oh, he just has night crazies. It's totally normal.
by kalexa October 27, 2009
 
2.
Those select few people who cannot control their actions after or during consumption of alcoholic beverages. They are capable of anything from a simple drunk text or phone call to a vigorous dance move putting an entire bar/establishment in awe. It is even possible that they could randomly hook up with any member of the same and or opposite sex and tightly grip an innappropriate area for no reason at all. These types of people are to be shunned and ignored at all costs, or it could be the last sight of your life.
Eric : "Dude, look at those girls outside Phoggy Dog. WTF are they doing?"

Bryan : "Isn't that Special K and E.W.? I thought the bar got a restraining order on them for the craziness they caused last time?"

Eric : "Fuckin night crazies, man. Let's get out of here, quick!"
by GormsMyGorms October 28, 2009