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The video discusses the negative effects of sleeping with your phone near your head, according to Dr. Brigitte Millot. She explains that keeping a phone within about 30 centimeters of your head while sleeping can lead to increased fatigue. This is because the phone screen emits signals similar to sunlight, which disrupts the brain's natural sleep processes. Specifically, it blocks the production of melatonin, a hormone crucial for sleep, and causes cortisol levels to rise. This disruption prevents the brain from fully resting. One speaker humorously notes their phone was even closer than 30cm, making the situation worse. The segment aims to educate listeners on why this habit is detrimental to sleep quality.