Sleep Is Your Superpower | Matt Walker | TED (Level 1)

Sleep is not just a luxury. It is very important for your health. Scientists have found that a lack of sleep hurts both the brain and the body. Without enough rest, your brain cannot learn new things. It is like a computer that cannot save files. If you do not sleep, your ability to learn drops by 40 percent. Sleep is also vital for your heart and immune system. When people lose just one hour of sleep, the number of heart attacks goes up. Also, the cells that fight cancer become weak. To sleep better, you should follow two main rules. First, go to bed and wake up at the same time every day. Second, keep your bedroom cool, around 18 degrees Celsius. If you cannot sleep, do not stay in bed. Get up and do something else until you are tired. Sleep is the best way to stay healthy and live a long life.