14. Sleep
Sleep is very important. You need 7-8 hours every night. People who say that they only need 6 or less hours per night are kidding themselves. A good night’s sleep specifically assists you to improve memory and concentration when you are awake. Sleep also helps to facilitate the activity of the immune system, thereby improving the chances that your body can defend you from diseases. Getting enough sleep prevents you from plunging into depression and protects your brain. The person who tries to get by with few hours of sleep every night is often referred to as burning the candle at both ends.