I pulled an all nighter a few nights ago and I can’t seem to catch up!
I am happy to be home but my brain is still on Italy time!
Taking three nightshifts in a row have really messed up my internal clock!
All these scenarios relate to circadian rhythm and often coincide with the concept of sleep patterns. Circadian rhythm encompasses a lot more than sleep – they encompass all physical, mental, and behavioral changes that follow a daily cycle. Most living things (animals, plants or even tiny microbes) have circadian rhythms, which follow both natural cues that the organism’s body makes and environmental cues, such as daylight and night cycles. In this article, we dive a bit deeper into understanding what exactly circadian rhythm is and how does it govern sleep.
Where do our natural circadian rhythms come from?
Clocks. Yes, that’s right. Every tissue and organ in our body have their own biological clocks. Clocks are innate timing devices that produce circadian rhythm. All clocks in our body are coordinated by the master clock located in the brain, which receives input from our eyes.
During the day, light causes the master clock to signal for alertness and wakefulness. At night, the master clock signals for the production of melatonin, a hormone that promotes sleep. The master clock works all night to keep us asleep.
Through environmental cues (light versus dark) and our body clocks, our circadian rhythm aligns our sleep and wakefulness with night and day. This creates a cycle of restorative rest that enables daytime activity. Any changes in light-dark cycles can change our biological clocks which in turn changes our circadian rhythm.
What happens when our circadian rhythm is off?
When circadian rhythm is thrown off, sleep is naturally thrown off. Without proper signaling from the body clocks, a person can struggle to fall asleep, wake up during the night or too early in the morning, or have decreased sleep quality. As a result, the person has excessive daytime sleepiness and exhaustion.
Because the clocks in every organ and tissue of your body are disrupted, those organ functions are also affected. Constant disruption of circadian rhythm results is linked to many chronic health conditions, including diabetes, depression, obesity, cancer, cardiovascular dysfunction, immune dysregulation, sleep disorders, bipolar disorder and reproductive problems.
How to maintain a healthy circadian rhythm
Here are some healthy sleep tips that can help train our bodies to adapt to a better cycle.
For more sleep tips, visit our other blog entry. These steps to improve sleep can be important for supporting a healthy circadian rhythm. If you have persistent sleeping problems, daytime drowsiness or a problematic sleep schedule, it is best to discuss with your doctor to figure out the cause and appropriate treatment regimen.
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Dr. Linda May-Zhang has over 10 years of research experience in nutrition, chronic diseases and pharmacology. She has published over 20 peer-reviewed academic papers in scientific journals. She is also a science writer with a passion for educating the lay public.