I’m not advocating a return to homes without artificial light—just a better understanding of the effects they have on us so that we can create better home environments. The use of home lighting, and most recently of computer screens, clocks, and various devices that emit blue light, has created a population of night owls. Currently only 30 percent of the population sleep best by going to bed before midnight. That means 70 percent of the population can’t get to work by eight or nine A.M. without waking their body up before it is biologically ready.
