key: cord-0946965-swp75ihu
authors: María Juliana, Leone; Mariano, Sigman; Diego Andrés, Golombek
title: Effects of lockdown on human sleep and chronotype during the COVID-19 pandemic
date: 2020-07-08
journal: Curr Biol
DOI: 10.1016/j.cub.2020.07.015
sha: 1ffee8cd9014593304f2a4058ac27a0d53d1e197
doc_id: 946965
cord_uid: swp75ihu

COVID-19 lockdown induced severe changes in light exposure and social cues. Leone et al. show that sleep is later and longer on weekdays, with lower social jetlag during lockdown compared with a controlcondition, in the same subjects (n=1021). Sleep quality is not affected but chronotype is later, which might eventually lead to desynchronization.

Leone et al. show that sleep is later and longer on weekdays, with lower social jetlag during 2 lockdown compared with a controlcondition, in the same subjects (n=1021). Sleep quality is not 3 affected but chronotype is later, which might eventually lead to desynchronization. We analyzed a database of 25,000 respondents of a detailed circadian/sleep survey in 33 Argentina. We compared sleep duration, quality and timing, social jetlag and chronotype 34 between control and lockdown conditions (Figure 1, Table S1 ) of 1021 subjects that completed 35 questionnaires both before and during the pandemic.

Sleep onset and offset were delayed during lockdown only on weekdays (Figure 1, Table S1 ). 37 The delay in the offset was greater than in the onset: weekdays sleep duration was longer 48 We measured chronotype using MSFsc (the midpoint of sleep on free days, sleep corrected; 49 based on sleep timing), which was significantly delayed during lockdown, and MEQ 50 (Morningness-Eveningness Questionnaire; based on daily preferences) score, which did not 51 change ( Figure 1E , Table S1 ). 

A novel coronavirus 143 outbreak of global health concern

The effects of self-selected light-dark 145 cycles and social constraints on human sleep and circadian timing: a modeling approach

The circadian clock and human health

National Sleep Foundation's 151 updated sleep duration recommendations: final report

A marker for the end of adolescence

Social jetlag and 155 obesity

Changes in sleep pattern, sense 157 of time, and digital media use during COVID-19 lockdown in Italy

Insomnia 160 and psychological reactions during the COVID-19 outbreak in China

Sleep, circadian disruption, and microbial-163 immune interactions: A new frontier

Sleep disturbance, sleep duration, 165 and inflammation: a systematic review and meta-analysis of cohort studies and 166 experimental sleep deprivation