When millions of people turn off their lights for Earth Hour each year, something remarkable happens in the night sky above ...

At night, that used to be the moon and stars – until humans invented artificial light. "The insects treat a point light source at night very much in the same way as they would treat the sky ...

At night, light can trigger insomnia, which is itself a risk for many illnesses. ... Blackout curtains are a must for bedroom windows facing exterior light sources.

Light exposure at night may disrupt our body's internal clocks, or circadian rhythms, that keep physiological processes ...

Those exposed to more light at night — defined in the study as 12:30 AM-6 AM — had a higher risk for type 2 diabetes. The risk went up as a dose response, Phillips said: The brighter the light ...