Circadian rhythm is the internal clock that makes us feel tired at nighttime and awake during the day. The circadian rhythm is an extremely intricate mechanism, with an internal control system that responds to external signals.
Despite its complexity, scientists think that circadian rhythm is one of life's most primitive adaptations. All living things have circadian rhythms, including animals of all sizes, plants, and even fungi and bacteria.
This list is full of circadian rhythm facts that should make you realize how important it is that you stay faithful to your circadian clock. This internal "clock" regulates more than just sleep - we rely on circadian rhythm to regulate metabolism, insulin and glucose levels, hormone production, core body temperature, brain wave activity, and cell regeneration. Almost all of our biological processes can be tied back to circadian rhythm, and messing with these biological rhythms can lead to serious health issues.So read on to learn about what your circadian clock does, and how to keep it working properly - it can truly be a matter of life or death.
One study found that birds that lived in cities had faster circadian rhythms than birds in the wilderness. The city birds started their days earlier and ended it later because of the artificial light and sounds of the environment.
What does that mean for humans? Research is ongoing, but there is reason to believe that the late nights associated with urban living have fundamentally changed our circadian rhythms and may contribute to depression, obesity, and other health issues.
A group of nerve cells in the brain called the suprachiasmatic nucleus, or SCN, controls our circadian rhythm. The SCN controls the body's temperature, and small fluctuations in temperature throughout the day will trigger various cells in different organ systems in the body to be active or inactive.
This is how the SCN controls the release of melatonin, the hormone that makes you sleepy.