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. 2021 Mar 26;44(9):zsab075. doi: 10.1093/sleep/zsab075

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© The Author(s) 2021. Published by Oxford University Press on behalf of Sleep Research Society.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 5. — Changes in sleep architecture in selected subpopulations. Changes in sleep architecture before and during lockdown compared to pre-lockdown weekday nights (reference) in (A) morningness and eveningness chronotypes, (B) insomnia (ISI <10 and ≥10), and (C) anxiety (HADS-A ≤10 and >10) subpopulations. TST = total sleep time; REM = rapid eye movement sleep; N2 = light sleep; SOD = sleep onset duration; N3 = deep sleep. x, significant lockdown effect; $, significant weekend effect; #, significant interaction between lockdown and weekend effects.