A study led by a neurosurgeon from UCLA has determined that sleepless nights slow down brain cells, creating mental lapses throughout the day. Itzhak Fried, the study’s director, said sleep deprivation breaks up brain cells’ ability to talk with one another, causing mental and visual lags that impair how we perceive the world around us (i.e. brain farts). Published in Nature Medicine, the study analyzed 12 participants with electrodes implanted into their brains. These participants were studied sorting a range of images as quickly as possible while fully rested and again after enduring a night without sleep. Their performance and brain cells slowed significantly after a sleepless night.