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Free-running sleep is a rare sleep pattern whereby the sleep schedule of a person shifts later every day. [1] It occurs as the sleep disorder non-24-hour sleep–wake disorder or artificially as part of experiments used in the study of circadian rhythms and other rhythms in biology .
Though often referred to as non-24, for example by the FDA, [30] the disorder is also known as: non-24-hour sleep–wake syndrome or disorder, [3] free-running disorder (FRD), [citation needed] hypernychthemeral syndrome, [31] hypernychthemeral sleep-wake cycle disturbance, [32] circadian rhythm sleep disorder—free-running type or ...
Sleep is a state of reduced mental and physical activity in which consciousness is altered and ... Scientists refer to such conditions as free-running of the ...
A circadian rhythm is an entrainable, endogenous, biological activity that has a period of roughly twenty-four hours. This internal time-keeping mechanism is centralized in the suprachiasmatic nucleus (SCN) of humans, and allows for the internal physiological mechanisms underlying sleep and alertness to become synchronized to external environmental cues, like the light-dark cycle. [4]
A zeitgeber (/ ˈ (t) s aɪ t ɡ eɪ b ər, ˈ z aɪ t-/ (T)SYTE-gay-bər, ZYTE-, German: [ˈtsaɪtˌɡeːbɐ]) is any external or environmental cue that entrains or synchronizes an organism's biological rhythms, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles.
A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), 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).
Tasimelteon, sold under the brand name Hetlioz, is a medication approved by the U.S. Food and Drug Administration (FDA) [3] in January 2014, for the treatment of non-24-hour sleep–wake disorder (also called non-24, N24 and N24HSWD). [4]
Free running can refer to: Freerunning, a physical discipline created by Sebastien Foucan, which is inspired by the movements of Parkour and Tricking; Free-running sleep is sleep with no outside regulation of its timing; Free Running, a 2007 video game developed by Rebellion and published by Ubisoft; Free Runners, an original English-language manga