Night

thumb|upright=1.5|In this illustration, politician Daniel O'Connell dreams of a confrontation between his outfit and that of [[George IV (r. 1820–1830; shown via a thought bubble)]]

The Lampyridae are a family of elateroid beetles with more than 2,400 described species, many of which are light-emitting. They are soft-bodied beetles commonly called fireflies, lightning bugs, or glowworms for their conspicuous production of light, mainly during twilight, to attract mates. The type species is Lampyris noctiluca, the common glow-worm of Europe. Light production in the Lampyridae is thought to have originated as a warning signal that the larvae were distasteful. This ability to create light was then co-opted as a mating signal and, in a further development, adult female firefl

thumb|Twilight is the period between dawn and [[sunrise, and between sunset and dusk.]] thumb|Morning twilight: astronomical, nautical, and civil stages at dawn. The apparent disk of the Sun is shown to scale. thumb|Evening twilight: civil, nautical, and astronomical stages at dusk. The solar disk is shown to scale.

thumb|right|Midnight at Metz railway station, in France Midnight is the transition time from one day to the next – the moment when the date changes, on the local official clock time for any particular jurisdiction. By clock time, midnight is the opposite of noon, differing from it by 12 hours.

natural phenomenon when the night lasts for more than 24 hours, occuring only inside the polar circles

period of twilight in the morning or evening

thumb|right|upright=1.35|Landers, California at nautical dusk (20-second exposure)

obsolete medical theory about the transmission of disease through bad air

dark sky in the deep twilight or at night

animal activity occurring at twilight

thumb|An LED nightlight A nightlight is a small light fixture, usually electrical, placed for comfort or convenience in dark areas or areas that may become dark at certain times, such as at night or during an emergency. Small long-burning candles serving a similar function are referred to as "tealights".

a person who tends to stay up until late at night

night with temperature of at least 20 degrees Celsius

school that holds classes from the late afternoon, usually for adults who work in the daytime

combat that occurs during the hours of darkness

thumb|right|Mexico City at night, showing skyglow thumb|A map from 1996 to 1997 showing the extent of skyglow over Europe

underwater diving during the hours of darkness

tactic of the German Air Force against British night bombers