kiri
"ヒトに必要な睡眠量には個体差があり、6 - 8時間の場合が多い。統計的には7時間の場合に平均余命が最も長くなる[要出典]。睡眠が不足した場合に最も影響のある精神活動は集中力である。計算能力、記憶能力、連想能力などはあまり低下しない。"
睡眠 - Wikipedia
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