insta-nap 

The act of napping or sleeping spontaneously anywhere and anytime, with no warning at all. Usually accompanied by lack of sleep or stress. May be considered a skill.

Josiah: Did you see that episode?
Yvette: Yea. It was funny.
Josiah: Yea, it was. I wonder what happen's next.
Yvette: zzzzzzzzzzzz.....
Josiah: wow. she just insta-napped on me. :|

insta-nap by ruggedly handsome brown dude April 2, 2011

Instanaps 

Basically when you fall asleep instantly out of knowhere

Victoria has instanaps

Instanaps by Einsteins half brother August 24, 2019

Instanaps 

When you instantly fall asleep out of nowhere

Kevin has diagnosed Victoria with Instanaps

Instanaps by Einsteins half brother August 24, 2019