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Article Dans Une Revue Nature and Science of Sleep Année : 2021

Social Jetlag Changes During the COVID-19 Pandemic as a Predictor of Insomnia – A Multi-National Survey Study

1 Uppsala University Hospital
2 FIHW - Finnish Institute for Health and Welfare
3 Helsingin yliopisto = Helsingfors universitet = University of Helsinki
4 Orton Ltd - Orton Orthopaedic Hospital
5 Medizinische Universität Wien = Medical University of Vienna
6 ULaval - Université Laval [Québec]
7 CERVO - Centre de recherche de l’Institut universitaire en santé mentale de Québec [Canada]
8 Nuffield Department of Primary Care Health Sciences, University of Oxford
9 Mississippi State University [Mississippi]
10 VIFASOM (URP_7330) - Sommeil-Vigilance-Fatigue et Santé Publique
11 Toronto Western Hospital
12 UNIMORE - Università degli Studi di Modena e Reggio Emilia = University of Modena and Reggio Emilia
13 Département de neurologie [Montpellier]
14 INM - Institut des Neurosciences de Montpellier
15 NCNP - National Center of Neurology and Psychiatry National Institute of Mental Health, Department of Clinical Laboratory and Department of Sleep-Wake Disorders
16 TWMU - Tokyo Women's Medical University
17 Department of Psychology [University of Roma "La Sapienza"]
18 Fondazione Santa Lucia [IRCCS]
19 Istituto delle Scienze Neurologiche di Bologna
20 Medical University of Gdańsk
21 BCM - Baylor College of Medicine
22 CUHK - City University of Hong Kong [Hong Kong]
23 Federal University of Rio Grande do Norte, Natal, RN, Brazil
24 Tokyo Medical University
25 Helsinki Sleep Clinic [Helsinki]
26 Uppsala Universitet [Uppsala]
27 Haukeland University Hospital
28 Feinberg School of Medicine
Frances Chung
Mariusz Sieminski
Yun Kwok Wing
Bjorn Bjorvatn


Lifestyle and work habits have been drastically altered by restrictions due to the COVID-19 pandemic. Whether the associated changes in sleep timing modulate the risk of suffering from symptoms of insomnia, the most prevalent sleep disorder, is however incompletely understood. Here, we evaluate the association between the early pandemic-associated change in 1) the magnitude of social jetlag (SJL) - ie, the difference between sleep timing on working vs free days - and 2) symptoms of insomnia. Patients and methods: A total of 14,968 anonymous participants (mean age: 40 years; 64% females) responded to a standardized internet-based survey distributed across 14 countries. Using logistic multivariate regression, we examined the association between the degree of social jetlag and symptoms of insomnia, controlling for important confounders like social restriction extension, country specific COVID-19 severity and psychological distress, for example. Results: In response to the pandemic, participants reported later sleep timing, especially during workdays. Most participants (46%) exhibited a reduction in their SJL, whereas 20% increased it; and 34% reported no change in SJL. Notably, we found that both increased and decreased SJL, as a result of the COVID-19 pandemic, were associated with later sleep midpoint (indicating a later chronotype) as well as more recurrent and moderate-to-severe symptoms of insomnia (about 23-54% higher odds ratio than subjects with unchanged SJL). Primarily those with reduced SJL shifted their bedtimes to a later timepoint, compared with those without changes in SJL. Conclusion: Our findings offer important insights into how self-reported changes to the stability of sleep/wake timing, as reflected by changes in SJL, can be a critical marker of the risk of experiencing insomnia-related symptoms - even when individuals manage to reduce their social jetlag. These findings emphasize the clinical importance of analyzing sleep-wake regularity.
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hal-03639894 , version 1 (16-06-2022)


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Luiz Eduardo Mateus Brandão, Teemu Martikainen, Ilona Merikanto, Brigitte Holzinger, Charles Morin, et al.. Social Jetlag Changes During the COVID-19 Pandemic as a Predictor of Insomnia – A Multi-National Survey Study. Nature and Science of Sleep, 2021, 13, pp.1711-1722. ⟨10.2147/NSS.S327365⟩. ⟨hal-03639894⟩
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