Recent studies have shown a strong link between sleep duration and overall health and longevity. While it’s commonly recommended that adults get 7 to 9 hours of sleep per night, emerging research suggests that consistently sleeping more than 9 hours may be associated with an increased risk of all-cause mortality. A large meta-analysis published in JAMA Internal Medicine in 2018 found that individuals who slept more than 9 hours daily had approximately a 30% higher risk of death compared to those who slept 7–8 hours. Importantly, this doesn’t mean long sleep directly causes death; rather, it may signal underlying health issues such as depression, chronic inflammation, cardiovascular disease, or metabolic disorders. Additionally, prolonged time in bed can lead to reduced physical activity, negatively affecting metabolism and immune function. Experts emphasize that individual sleep needs vary, and the key lies in sleep quality and consistency. If someone frequently feels excessively sleepy or fatigued during the day despite long sleep durations, they should consult a healthcare provider to rule out potential medical conditions. Therefore, maintaining moderate, high-quality sleep is essential for long-term health.
近年来，多项研究表明，睡眠时间与健康和寿命密切相关。虽然普遍建议成年人每晚睡7至9小时，但最新研究指出，长期睡眠超过9小时可能与全因死亡风险增加有关。2018年发表在《美国医学会杂志·内科学》（JAMA Internal Medicine）上的一项大型荟萃分析发现，每日睡眠超过9小时的人群，其死亡风险比睡眠7-8小时者高出约30%。这并不意味着长睡眠直接导致死亡，而是可能反映出潜在的健康问题，如抑郁症、慢性炎症、心血管疾病或代谢紊乱等。此外，长时间卧床也可能减少身体活动，影响新陈代谢和免疫功能。专家强调，个体对睡眠的需求存在差异，关键在于睡眠质量和规律性。若经常感到白天嗜睡、疲劳，即使睡眠时间较长，也应咨询医生排查潜在病因。因此，保持适度、高质量的睡眠，才是维护长期健康的关键。
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