Top Definition
A two-person sleeping position in which both lay in a head to toe position and utilize the others' knee as a pillow.

Invented during WWII by a group of imprisoned U.S.S.R. soldiers in an effort to help each other survive the harsh climate and inadequate conditions.
Hey, man. This floor hurts my neck. Can we Sleepy Nine?
by Sir Isaac Wellington May 03, 2009
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