Some say the key to success lies in not sleeping. The truth is you might get more done, but sleep is essential to your health. What’s the point of successes if you’re too sick to enjoy it? Sleep is crucial for recollection, learning, metabolism, and other vital functions of the body. Knowing how long to sleep is important. Lifehacker has the perfect guide on how long to nap for the biggest brain benefits. The next time you stay up all night studying, grading, reading, or partying, it might help to squeeze in a 10-minute power nap throughout the day.