2. The Yawn
The 9 Stages Of Sleep Deprivation Stage 2 - Image 1

You allow yourself one innocent deep breath, but soon you're indulging in the most satisfying yawn in history. You try to go back to work, but you can't because everyone isÂ…yawning. Oh god, you can't stop, none of you can stop! Congratulations patient zero, you just started the zombie apocalypse.