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- Night or nighttime is the period of darkness when the Sun is below the horizon. The opposite of nighttime is daytime. Sunlight illuminates one side of the Earth, leaving the other in darkness. Earth's rotation causes the appearance of sunrise and sunset. Moonlight, airglow, starlight, and light pollution dimly illuminate night.
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Aug 31, 2023 · A biological clock is a mechanism internal to organisms that, in the absence of an environmental signal, operates at its own frequency. The regular alternation of...
- Audrey Mat
Sep 30, 2022 · Despite the abundance of night-time life, the understanding of nocturnal species has evaded science throughout history. Physical restraints on human navigation in the dark are partially...
Night. Night sky over a bog in Estonia, with light pollution visible on the horizon. Night or nighttime is the period of darkness when the Sun is below the horizon. The opposite of nighttime is daytime. Sunlight illuminates one side of the Earth, leaving the other in darkness.
Eating, sleeping, seasonal migration, cell proliferation—a few examples of the many behaviors and life processes that are driven by biological clocks. These “chronometers” coordinate the passage of time with orchestrated cycles that extend from molecular through cellular and systems levels.
- Martha U. Gillette, Terrence J. Sejnowski
- 2005
May 26, 2017 · Abstract. Human sleep is highly regulated by temperature. Might climate change—through increases in nighttime heat—disrupt sleep in the future? We conduct the inaugural investigation of the relationship between climatic anomalies, reports of insufficient sleep, and projected climate change.
- Nick Obradovich, Nick Obradovich, Robyn Migliorini, Robyn Migliorini, Sara C. Mednick, James H. Fowl...
- 2017
Nov 14, 2021 · Patrizia Caraveo. 600 Accesses. Abstract. The vast majority of life forms on Earth need the night. The rotation of the Earth has imposed the day-night rhythm, that is, the regular sequence of light and darkness, on all species that have evolved on our planet.
Nov 2, 2020 · This goes further in some groups, such that diurnal species can use the so-called ‘night-time niche’ to extend their activity into the night-time 15. Fig. 3: Activity patterns and light intensity.
