Sleep is a natural and essential part of our existence.
Sleep deprivation has been cited as a primary or secondary cause of numerous industrial and motor vehicle accidents. People with sleep problems tend to work inefficiently or miss work altogether. Others have unexplained sleepiness in the daytime that become extremely disruptive and dangerous. Even stable marriages have suffered from loud and unabated snoring, sleep walking, sleep talking, and tooth grinding. The amount of sleep required varies with each individual, with the average being 72 hours.