为什么说冬天熬夜比夏天熬夜更危险？？？

Core Viewpoint - Staying up late is particularly dangerous in winter due to reduced sunlight exposure, which affects melatonin secretion and overall health. Group 1: Impact on Sleep Quality - Winter nights lead to increased difficulty in falling asleep and maintaining sleep quality due to delayed melatonin secretion [14][19]. - Research indicates that 17.6% of women and 9.0% of men report insomnia in winter, significantly higher than other seasons [21]. - A study involving 13,296 French employees found that insufficient natural light correlates with a 28.8% insomnia rate [21]. Group 2: Emotional and Mental Health Effects - Lack of sunlight in winter can lead to lower levels of Vitamin D, which is essential for serotonin and dopamine production, potentially resulting in depression [32][33]. - Seasonal Affective Disorder (SAD) is characterized by winter depression, with symptoms worsening in low-light conditions [36][37]. - Research shows that shorter sleep duration increases the risk of depression, with a notable correlation between sleep time and depression risk scores [40][41]. Group 3: Physical Health Risks - Sleep deprivation increases susceptibility to cold, as studies show that lack of sleep impairs the body's ability to regulate temperature [50][52]. - Winter is a high-risk season for heart-related issues, with studies indicating a higher incidence of myocardial infarction at temperatures below 0°C [63][64]. - A long-term study found that individuals who sleep after midnight have a 62.8% higher risk of heart attack compared to those who sleep earlier [68][69].