Take care of your machine 1. It - eat a proper diet. Page 340 has some good suggestions 2. It - get proper exercise.
Sleep is a period during which a person rests body and mind.
Sleep restores energy to the body, particularly to the brain and nervous system. The body clock that regulates sleep is called the circadian clock. The circadian clock influences body temperature, sleep and wakefulness and some hormonal changes. Even two days without sleep can result in hallucinations. Stress can cause physical problems such as depression or headaches.