Willpower and doughnuts

I'm so tired I can hardly keep my head up let alone my eyes open. What's keeping me going? Willpower and doughnuts!

"I wonder why I don't go to bed and go to sleep. But then it would be tomorrow, so I decide that no matter how tired, no matter how incoherent I am, I can skip one hour more of sleep and live.”
(Sylvia Plath)