Definitions by J-Soul

Mattress Nook 

The divot in a mattress caused by sleeping in the same spot repeatedly.

Person A: "Man, I really need to sleep in a different spot once in a while. I had to climb out of my mattress this morning."

Person B: "Sounds like you have a pretty serious mattress nook

Mattress Nook by J-Soul December 9, 2010