The pervasive glow of smartphones and tablets has become a ubiquitous feature of modern adolescence. While these devices offer unprecedented access to information and social connection, a growing body of scientific research is illuminating a significant downside: their detrimental impact on sleep. For teenagers, whose brains and bodies are undergoing critical development, the consequences of poor sleep are particularly pronounced. This passage delves into the specific neurological and psychological mechanisms through which screen time, particularly in the hours before bed, disrupts adolescent sleep patterns, leading to a phenomenon known as delayed sleep onset. A. At the core of our sleep-wake cycle is a master internal clock located in the brain, known as the suprachiasmatic nucleus (SCN). The SCN orchestrates a 24-hour cycle of physiological processes, collectively referred to as circadian rhythms. A key component of this rhythm is the production of melatonin, a hormone that signals to the body that it is time to sleep. As natural light fades in the evening, the SCN prompts the pineal gland to release melatonin, inducing drowsiness. Conversely, exposure to light, particularly in…
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