During our waking moments our nerve cells are constantly active and become more or less fatigued. Sleep gives the body cells an opportunity of ridding themselves of waste and of repairing themselves. To insure a recovery period from such fatigue, we undergo the periodic loss of consciousness known as sleep. Sleep is such an important bodily function, and even though we might put off going to sleep, eventually sleep will take over.
Sleep is a type of unconsciousness and is a state of being unaware of the world.
Sleep is essential to good health as it refreshes the body and the mind. If you get enough sleep regularly every night you will feel and also be able to work better. The answer depends on the individual. Some people need a great deal of sleep, while others require only a minimum of sleep. The individual needs to get the amount of sleep necessary to feel alert, healthy, and totally fit.