Circadian Health
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How Does the Circadian Rhythm Affect Our Sleep Patterns?

Light therapy, also called phototherapy or bright light therapy, is a treatment involving exposure to artificial light at controlled wavelengths and time points to treat a variety of medical and non-medical conditions.

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How Does the Circadian Rhythm Affect Our Sleep Patterns?
The circadian rhythm affects our sleep patterns in various ways. When our body’s internal clock is functioning properly, we experience increased alertness during the day and a natural feeling of sleepiness at night. This results in a healthy and consistent sleep pattern that allows us to wake up feeling rested and refreshed in the morning. However, disruptions to our circadian rhythm can lead to various sleep problems, such as insomnia or excessive daytime sleepiness.

What Happens When the Circadian Rhythm Is Disrupted?

Our circadian rhythm can face disruptions from factors like jet lag, shift work, or irregular sleep schedules. When this happens, our body’s internal clock is thrown off balance, and our natural sleep-wake cycles are disrupted. For instance, one may not be able to sleep at night. This can result in having fewer hours of sleep and sleep during the day.

How Can Disruptions to the Circadian Rhythm Affect Our Sleep?

Cortisol and Sleep:

Cortisol, which is a glucocorticoid hormone that your adrenal glands produce and release, usually decreases in the evening and thereby helps promote sleep. However, disruptions, like stress or excessive device use emitting blue light, can interfere with this natural decline.

Stress and Cortisol:

The experience of stress is accompanied by changes in the body’s cortisol profile. In the evening, a stress-experience-related increase in cortisol can interfere with the usual drop in cortisol at that time of day, which is needed for good sleep. People dealing with chronic stress may find it hard to fall asleep, leading to insomnia.

Electronic Devices and Sleep Disruption:

Using electronic devices, especially close to sleep onset, can disturb our sleep and the body’s internal biological clock. Increased levels of alertness depending on the media content consumed can interfere with a consistent sleep time. Engaging with stimulating content can make it tough for the body to shift into a sleep-friendly state. And also the bright light from screens can suppress melatonin.

Insomnia as a Result:

When disruptions like circadian rhythm imbalance, high cortisol levels, and electronic device impact add up, it can contribute to insomnia. Insomnia, characterized by ongoing difficulty falling or staying asleep, can become a lasting issue if these disruptions persist.


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