Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, 100191, China.
Peking University Health Science Center, Beijing, 100191, China.
Sleep Med. 2024 Jul;119:214-221. doi: 10.1016/j.sleep.2024.04.021. Epub 2024 Apr 17.
Napping is garnering increased attention as a strategy for adults to sustain alertness and alleviate stress in contemporary society. The nuances of napping habits are emerging as an independent factor influencing the extent of individual benefits. This study aimed to demonstrate the long-term benefits of napping and explore the impact of napping habits on individual alertness, as well as whether this effect was correlated with cortisol levels.
The study involved 80 healthy adults categorized into two groups based on self-reported napping habits: habitual nappers (n = 49) and non-habitual nappers (n = 31). Karolinska Sleepiness Scale (KSS), psychomotor vigilance task (PVT), and saliva collection were performed every 30 min within 90 min in the absence of napping during the afternoon dip. The measurements were analyzed using repeated measures ANOVA and Pearson correlation analyses.
There was an interaction between groups and time in reaction speed and lapse number of PVT and cortisol (all p < 0.05). Post hoc analysis found that habitual nappers maintained higher objective alertness and experienced more significant increases in cortisol over time (all p < 0.05). The cortisol levels at sleepiness time were negatively associated with the slowest 10 % reaction speed of PVT in non-habitual nappers (r = -0.409, p = 0.022).
Under the premise of mitigating the impacts of acute nap deprivation on sleep homeostasis and rhythm, napping habits emerge as a potential factor influencing the ability of individuals to sustain heightened alertness.
在当代社会，打盹作为一种维持警觉和缓解压力的策略，正受到越来越多的关注。打盹习惯的细微差别正在成为影响个体受益程度的一个独立因素。本研究旨在展示打盹的长期益处，并探讨打盹习惯对个体警觉性的影响，以及这种影响是否与皮质醇水平相关。
该研究纳入了 80 名健康成年人，根据自我报告的打盹习惯分为两组：习惯性打盹者（n=49）和非习惯性打盹者（n=31）。在下午困倦期间，不打盹的情况下，每隔 30 分钟进行一次 Karolinska 睡眠量表（KSS）、精神运动警觉任务（PVT）和唾液采集，共 90 分钟。使用重复测量方差分析和 Pearson 相关分析对测量结果进行分析。
在反应速度和 PVT 的失误次数以及皮质醇方面，组间和时间存在交互作用（均 p<0.05）。事后分析发现，习惯性打盹者保持了更高的客观警觉性，并且随着时间的推移皮质醇水平显著升高（均 p<0.05）。非习惯性打盹者在困倦时的皮质醇水平与 PVT 最慢的 10%反应速度呈负相关（r=-0.409，p=0.022）。
在缓解急性午睡剥夺对睡眠稳态和节律影响的前提下，打盹习惯成为影响个体维持高度警觉能力的潜在因素。
