Sleep is a regulated biological function, part of the body’s homeostasis, universally experienced as a state of unawareness, in which most of us will spend nearly one-third of our lives. It affects our lives on many levels and touches so many other bodily functions that when it is disrupted, we can be left with very serious deficits.
In the USA, nearly 25% of the population complains of some kind of sleep disturbance. Shift-workers are prone to have their circadian rhythm disrupted especially if they must rotate shifts. And, sleep disturbances can lead to many other problems, including public health issues when so many of us are also trying to drive while sleep-deprived!