营销话术证据 B · meta 分析
我是夜猫子, 熬夜对我没代价
真相
早晚型体质确实可遗传（Jones 2019，351 个位点），但天生晚睡不等于熬夜没代价：社会时差越大，超重者体重指数越高（Roenneberg 2012）。顺着节律睡够才健康。
机制速览
前面讲的是通宵的代价，这一章回到源头：人为什么会熬夜？一部分是天生的生物钟节律，一部分是行为习惯——这两者要分开看，因为解法完全不同。
来源（2）
- Jones, S. E., Lane, J. M., Wood, A. R., van Hees, V. T., Tyrrell, J., Beaumont, R. N., et al. (2019). Genome-wide association analyses of chronotype in 697,828 individuals provides insights into circadian rhythms. Nature Communications, 10, 343. Identified 351 loci associated with morningness, confirming chronotype is substantially heritable; the most morning-leaning carriers slept ~25 min earlier.
- Roenneberg, T., Allebrandt, K. V., Merrow, M., & Vetter, C. (2012). Social jetlag and obesity. Current Biology, 22(10), 939-943. The mismatch between biological and social clocks (social jetlag) was positively associated with higher BMI among the overweight, linking circadian misalignment to weight.