2002年サンディエゴ大学の研究では、睡眠時間が短い場合 長い場合ともに死亡するリスクが1.3倍まで高まっていることが判明しました。
They included 1,382,999 male and female participants (followup range 4 to 25 years), and 112,566 deaths. Sleep duration was assessed by questionnaire and outcome through death certification. In the pooled analysis, short duration of sleep was associated with a greater risk of death (RR: 1.12; 95% CI 1.06 to 1.18; P < 0.01) with no evidence of publication bias (P = 0.74) but heterogeneity between studies (P = 0.02). Long duration of sleep was also associated with a greater risk of death (1.30; [1.22 to 1.38]; P < 0.0001) with no evidence of publication bias (P = 0.18) but significant heterogeneity between studies (P < 0.0001).
https://www.researchgate.net/publication/44599220_Sleep_Duration_and_All-Cause_Mortality_A_Systematic_Review_and_Meta-Analysis_of_Prospective_Studies
この研究は138万人のサンプルを調べたシステマティックレビューになります。