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Caro discusses why sleeping next to your phone is detrimental, citing it as a major cause of fatigue. She explains that phones, even when not in active use, emit signals similar to the sun, which can prevent the brain from fully resting. This interference impacts melatonin production, a hormone crucial for sleep, causing it to be blocked, while cortisol levels, associated with stress, increase. Although the information presented was somewhat disorganized, the core message is that the proximity of a phone to one's head during sleep disrupts the brain's ability to achieve complete rest due to the signals it emits, thereby contributing significantly to fatigue. The speaker admitted to having their phone even closer than the recommended distance, highlighting the commonality of the issue.