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Scientists believe sleep is necessary for our nervous system to function, and that sleep allows some neurons to repair themselves (NIH). These researchers used an animal study to show that several nerve-signaling patterns produced during the day recurred during sleep, and that this pattern may help improve learning. Together with test-anxiety, this study probably accounts for my strange dreams before a Spanish exam where I would review vocabulary. This extra preparation might have improved my Spanish grade, but the sleep deprivation caused drowsiness and I would sometimes miss questions. Before exams, I now clear my mind before sleeping with a book and leave my radio on throughout the night. After nights of too little sleep, I now understand the NS consequences of drowsiness, decreased concentration, and impaired memory.