Sceadu meant "shadow" and remained in use.
Even without artificial light, moonlight sometimes makes it possible to travel or work outdoors at night. Since the invention of electric light in the 19th century, the night has been getting progressively brighter, but things really took off in the s.
During the night, in the dark, body temperature drops, metabolism slows, and the hormone melatonin rises dramatically. In the evening hours, it's important to maintain low lighting, and allow your body to undergo its natural physiological move toward sleep.
Now we know that blue, short wave-length light is captured by the newly discovered photopigment melanopsin in the retina, and that when blue light stops, we start our physiological transition to nighttime mode.
Other kinds of light, like dimmer long wavelength yellow and red light, have very little effect on this transition. Outdoor environments are relentlessly lit, and more and more people use computer tablets and smart phones at all hours, bathing their faces in bright blue light at times of day when they should be transitioning to nighttime physiology.
On the equinoxes, daytime actually lasts almost 14 minutes longer than night does at the Equatorand even longer towards the poles.