Definitions by White Xmas

Night wood 

It's like morning wood, but you get it before going to sleep. It's an erection that just keeps you awake for a while and you can't fall asleep with it. One simply has to work it out.

Mom: Go to sleep honey!
Orlando (to himself): Damn this night wood, I'm really tired and I just want to go to sleep.

Night wood by White Xmas December 27, 2013