A Harvard University researcher suggests that electric lighting in the evenings plays a disruptive role on our natural 24-hour body clock or "circadian rhythm" and affects our sleep.
The report, published in the journal Nature, states that electric lighting leaves us checking our mails or watching television during late evenings and keeps our body alert when it should be winding down for sleep.
Study author Prof Charles Czeisler adds that the blue light using in televisions, computers and tablet screens has been proven to be more disruptive compared to traditional incandescent lighting and replacing this blue light with red or orange-enriched light in the evenings could reduce the impact of modern light on our bodies.
"Night-time exposure to LEDs is typically more disruptive to circadian rhythms, melatonin secretion and sleep than incandescent lighting. The adverse effects of night-time light on sleep and circadian rhythms can be reduced by replacing blue-enriched light with red- or orange- enriched white light after sunset", Czeisler said.