Circadian Rhythm Sleep Disorders - Glossary
Glossary
Circadian rhythm: (circa=about; dies=day) - Approximately 24-hour cycles that are generated endogenously by an organism (eg, sleep-wake cycle)Ultradian rhythm: Biological rhythms that are shorter than a 24-hour cycle (eg, sleep stages)
Entrainment: Synchronization of the circadian rhythms with environmental cues
Free-running clock: Persistence of circadian rhythms in the absence of environmental cues (eg in patients with impaired ability to entrain or in those without time cues)
Zeitgeber (time giver): Specific environmental variables that provide time cues (eg, light, food-availability cycles)
Sleeplessness (insomnia): Difficulty initiating or maintaining sleep
Circadian rhythm disorders: Malfunction of the circadian timing system or the biological clock
Cortisol: A corticosteroid hormone produced by the adrenal cortex. It is involved in the response to stress; it increases blood pressure, blood sugar levels, may cause infertility in women, and suppresses the immune system.
Serotonin (5-hydroxytryptamine, or 5-HT): is a monoamine neurotransmitter. It is believed to play an important role in the regulation of mood, sleep, emesis (vomiting), sexuality and appetite.
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Dr. Anitha Paderla. (2021, July 28). Circadian Rhythm Sleep Disorders - Glossary. Medindia. Retrieved on Nov 24, 2024 from https://www.medindia.net/health/conditions/circadian-rhythm-sleep-disorders-glossary.htm.
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Dr. Anitha Paderla. "Circadian Rhythm Sleep Disorders - Glossary". Medindia. https://www.medindia.net/health/conditions/circadian-rhythm-sleep-disorders-glossary.htm. (accessed Nov 24, 2024).
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Dr. Anitha Paderla. 2021. Circadian Rhythm Sleep Disorders - Glossary. Medindia, viewed Nov 24, 2024, https://www.medindia.net/health/conditions/circadian-rhythm-sleep-disorders-glossary.htm.