Circadian

A circadian rhythm, or circadian cycle, is a natural, internal process that regulates the sleep–wake cycle and repeats roughly every 24 hours. It can refer to any process that originates within an organism and responds to the environment. These 24-hour rhythms are driven by a circadian clock, and they have been widely observed in animals, plants, fungi and cyanobacteria. The term circadian comes from the Latin circa, meaning "around", and dies, meaning "day". Processes with 24-hour cycles are more generally called diurnal rhythms; diurnal rhythms should not be called circadian rhythms unless they can be confirmed as endogenous, and not environmental. Although circadian rhythms are endogenous, they are adjusted to the local environment by external cues called zeitgebers, which include light, temperature and redox cycles. In clinical settings, an abnormal circadian rhythm in humans is known as a circadian rhythm sleep disorder.

Read more in the app

New clues into how the circadian clock helps the brain recover after injury

Diabetes: When circadian lipid rhythms go wrong

Circadian rhythm disruption found to be common among mental health disorders

Research Reveals the Circadian Clock Influences Cell Growth, Metabolism and Cancer Progression

New research reveals the circadian clock influences cell growth, metabolism and tumor progression

Circadian clocks play a key role in fat cell growth

Circadian rhythm in cognitive and physical health

Researchers decode retinal circuits for circadian rhythm, pupillary light response

Prostate Cancer Hijacks Tumor Cells’ Circadian Rhythm To Evade Hormone Therapy

Chronobiologists identify key circadian clock mechanism in cyanobacteria

What Drives the Circadian Rhythms: Unlocking Complex Workings of the Biological Clock

Links between circadian rhythms, metabolism and addiction

Brain’s Ability To Clear Protein Linked to Alzheimer’s Disease Controlled by Circadian Cycle

We Just Got Closer to Finding a Link Between Alzheimer's And Circadian Rhythms

Clearance of protein linked to Alzheimer's controlled by circadian cycle

Circadian Rhythms Control Immune Cells That Clear Away Alzheimer’s Disease Protein

The circadian clock in heart failure

The Obesity Paradox and Circadian Rhythms in Heart Failure

Sleep disorders and non-sleep circadian disorders predict depression: a systematic review and meta-analysis of longitudinal studies

Alcohol consumption is affected by a protein linked to the circadian rhythm