Circadian rhythms are cycles in the body that occur roughly across 24 hours. In humans, circadian rhythms cause physical and mental changes in the body, including feelings of wakefulness and sleep.

Sleep is a universal biological state that allows all animals, from mammals to amphibians, fish and even insects, to restore ...

Biological rhythms are like internal clocks that regulate various bodily functions, including sleep, appetite, hormone levels, and blood pressure. Disruptions to these rhythms can lead to sleep ...

Elevated dementia risks among older adults were associated with weaker and more fragmented circadian rest-activity rhythms ...

The rhythm is either sinus rhythm or not sinus rhythm. Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node.