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circadian rhythm

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Circadian rhythm is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours. It is influenced by external cues like light and temperature. A well-aligned circadian rhythm promotes better sleep by ensuring that the body is prepared for rest at night and alertness during the day. Disruptions to this rhythm, such as exposure to light during nighttime or irregular sleep schedules, can lead to sleep disorders and reduced sleep quality.

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The Science of Light and Sleep: How Illumination Shapes Our Rest

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Light, whether natural or artificial, interacts with the brain’s suprachiasmatic nucleus (SCN) to synchronize these rhythms with the 24-hour day. This article explores the scientific evidence behind light’s impact on sleep, from daily light exposure to extreme seasonal variations in places like northern Scandinavia, and offers actionable advice for optimizing sleep through light management.

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