Our bodies evolved to rise with the sun and rest with the moon, and then the lightbulb ruined it all. Artificial light—emitted by everything from office fluorescents to phones—contains sun-replicating blue wavelengths that keep us up into the wee hours, which can potentially lead to obesity, depression, and other diseases, as well as what a doctor might describe as general crankiness.
To remedy this, you could crawl into a hole every night at sundoThe wn, a not altogether unappealing way to avoid Wi-Fi and work e-mail; or invest in a smarter light source. Like the Lighting Science Group’s new Genesis LED lamp, which emits different tones at different times of day to mimic the effect of natural sunshine and twilight. “It allows us to have light at night, to do things we think are useful—and maybe still go to sleep,” says Fred Maxik, the company’s founder.
