2026-06-16 カロリンスカ研究所（KI）
◆研究では29～85歳の男女各238人を対象に、自宅で終夜睡眠ポリグラフ検査を実施し、翌朝に睡眠の自己評価を行った。その結果、女性は男性より総睡眠時間が長く、睡眠効率が高く、深睡眠も多く、1時間当たりの覚醒回数も少なかった。一方で、女性は睡眠の質を男性より低く評価していた。研究者らは、この「睡眠パラドックス」の要因として、女性が夜間の短時間覚醒をより正確に認識・記憶していることを指摘した。男性は短い覚醒を過小評価する傾向があり、そのため睡眠をより良好と感じている可能性が示された。短時間覚醒の影響を統計解析から除くと、男女間の主観的睡眠評価の差は消失した。また、この傾向は高齢になるほど顕著となり、男性では深睡眠の減少や覚醒増加が進む一方、女性の睡眠の悪化は比較的小さかった。それでも女性は一貫して睡眠の質を低く評価していた。
＜関連情報＞
- https://news.ki.se/women-sleep-better-than-men-but-experience-the-opposite
- https://academic.oup.com/sleepadvances/article/7/2/zpag048/8663014
客観的睡眠と自己申告睡眠における性差 Gender differences in objective and self-reported sleep
Torbjörn Åkerstedt ,Johanna Schwarz ,Eva Lindberg ,Jenny Theorell-Haglöw
SLEEP Advances Published:27 April 2026
DOI:https://doi.org/10.1093/sleepadvances/zpag048
Abstract
It is not clear whether gender differences in self-reported sleep reflect polysomnographical differences. We here investigated gender differences in polysomnography (PSG) variables and their association with rated sleep quality for recorded sleep. The participants were 238 women and 238 men who were recorded for a night with PSG (home recordings), and provided sleep quality ratings for the recorded night. Analyses of variance showed that women reported significantly lower sleep quality than men, but it showed significantly better PSG sleep (fewer awakenings per hour, lower N1%, longer total sleep time, higher sleep efficiency, and more N3%, among others). However, men underestimated their objective number of awakenings and had a shorter objective time awake per objective awakening (6.4 ± .6 vs 8.2 ± .6 minutes for women, p < .05). Men with short awakenings (<7.8 min per awakening) had a high self-reported sleep quality, in contrast to men with long awakenings or women regardless of the duration of awakenings. When men with short awakenings were excluded, self-reported sleep quality no longer differed between genders. Gender differences in PSG variables increased with age. In addition, better self-reported sleep quality was associated with “better” PSG values for both genders. In conclusion, women reported poorer sleep quality than men but showed better objective sleep. It is suggested that men’s better self-reported sleep is associated with an inability to perceive/remember short awakenings. The findings open a new view of gender differences in sleep, and indicate a need for experimental studies on gender differences in the perception of awakenings, their duration, and rated sleep quality.
