Why does poor sleep sap willpower? For starters, sleep deprivation impairs how the body and brain use glucose, their main form of energy. When you’re tired, your cells have trouble absorbing glucose from the bloodstream. This leaves them underfueled, and you exhausted. With your body and brain desperate for energy, you’ll start to crave sweets or caffeine. But even if you try to refuel with sugar or coffee, your body and brain won’t get the energy they need because they won’t be able to use it efficiently. This is bad news for self-control, one of the most energy-expensive tasks your brain can
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