It's wrong to sleep on someone else's dime.
Glenn did not sleep well the night before and is feeling very tired during his shift.
Glenn wants to stop feeling so tired at work.
Glenn makes himself a few cups of strong coffee to get the caffeine kick.
Glenn goes to the supply closet when no one is looking to take a quick nap.
Glenn perks up a little thanks to the caffeine, and he is able to make it through the rest of his shift before going home to sleep.
Glenn gets caught by his manager and is written up for sleeping at work.