3. Artificial light and brain confusion
Artificial light at night confuses the brain’s natural timing system, the suprachiasmatic nucleus, located in the hypothalamus. This internal clock relies on natural light cues to regulate sleep and wakefulness. When artificial light is present during night hours, it sends conflicting signals that disrupt this clock.
Exposure to light—especially blue and white wavelengths—after sunset can make the brain think it is still daytime, delaying the production of melatonin and interfering with the body’s ability to prepare for sleep. This confusion can lead to irregular sleep patterns and difficulty maintaining consistent sleep quality.
4. Sleep quality reduction
Disruptions caused by artificial light and screen exposure reduce the amount of deep, restorative sleep phases, such as slow-wave sleep and REM sleep. These stages are crucial for memory consolidation, emotional regulation, and physical recovery.
When sleep quality deteriorates, even a full night’s duration may not be sufficient to feel rested. This can cause persistent tiredness, irritability, and decreased cognitive performance during the day.
5. Mental fog and tiredness
Reduced sleep quality often manifests as mental fog—difficulty concentrating, slower reaction times, and impaired decision-making. These symptoms can affect work performance, increase the risk of accidents, and lower overall quality of life.
Chronic tiredness also weakens the immune system and may contribute to mood disorders such as anxiety and depression.
