The authors observe that among adults, between 7 and 8 hours of nighttime sleep appears to be the optimum duration to protect against common diseases and premature death.

• 与总死亡率相关。作者指出：在成年人中7至8小时的夜间睡眠时间似乎是最佳的，为防止常见疾病及过早死亡的发生。