The accelerated time frames of industrialized societies separate people from the rhythms of nature, distancing them from the periodicities that make up the many physiological time worlds of the biosphere. Humanity has developed an artificial time environment governed by mechanical contrivances and electronic impulses. This linear form of time is quantitative, fast-paced, efficient and predictable.
A 1996 study found that long exposure to normal levels of indoor lighting can reset the human biological clock, which implies that many people in industrialized countries may be continuously sleep-deprived, and so in a permanent state of jet lag-like tiredness. Brighter light resets the biological clock more quickly than does ambient light, and may be more useful for treating this jet lag -like tiredness and shift work. Lower light might require more time to take effect.
Isolation from nature is not just a matter of living in cities. Even more important, it involves a momentous change in man's outlook on the world. Men do not simply coexist with nature; they search for meaning in it. All religions in their integrative functions and rituals explain and support the basic solidarity between man and nature. Such beliefs help create and sustain the bond between man and the external world.