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  2. Diurnal cycle - Wikipedia

    en.wikipedia.org/wiki/Diurnal_cycle

    A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. [ 1 ] Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year. The diurnal cycle depends mainly on incoming solar radiation.

  3. Photoperiodism - Wikipedia

    en.wikipedia.org/wiki/Photoperiodism

    Photoperiodism is the physiological reaction of organisms to the length of light or a dark period. It occurs in plants and animals. Plant photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods. They are classified under three groups according to the photoperiods: short-day ...

  4. Diurnality - Wikipedia

    en.wikipedia.org/wiki/Diurnality

    Diurnality is a form of plant and animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night. The common adjective used for daytime activity is " diurnal ". The timing of activity by an animal depends on a variety of environmental factors such as the temperature, the ability to gather food ...

  5. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]Segmented sleep and divided sleep may ...

  6. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ sərˈkeɪdiən /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment). Circadian rhythms are regulated by a circadian clock whose ...

  7. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, noon, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.

  8. Diel vertical migration - Wikipedia

    en.wikipedia.org/wiki/Diel_vertical_migration

    Diel vertical migration (DVM), also known as diurnal vertical migration, is a pattern of movement used by some organisms, such as copepods, living in the ocean and in lakes. The adjective "diel" (IPA: / ˈdaɪ.əl /, / ˈdiː.əl /) comes from Latin: diēs, lit. 'day', and refers to a 24-hour period. The migration occurs when organisms move up ...

  9. Night - Wikipedia

    en.wikipedia.org/wiki/Night

    The day-night cycle is one consideration for planetary habitability or the possibility of extraterrestrial life on distant exoplanets. [38] In general, shorter nights result in a higher equilibrium temperature for the planet. [39] On an Earth-like planet, longer day-night cycles may increase habitability up to a point. [40]

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