https://www.sciencedaily.com/releases/2020/06/200610112107.htm

"Usually, we would expect a decrease in social jetlag to be associated with reports of improved sleep quality," says sleep researcher and cognitive neuroscientist Christine Blume from the University of Basel's Centre for Chronobiology, Switzerland. "However, in our sample, overall sleep quality decreased. We think that the self-perceived burden, which substantially increased during this unprecedented COVID-19 lockdown, may have outweighed the otherwise beneficial effects of a reduced social jetlag."

In their study, Blume and colleagues including Marlene Schmidt and Christian Cajochen explored the effects of the strictest phase of the COVID-19 lockdown on the relationship between social and biological rhythms as well as sleep during a six-week period from mid-March until end of April 2020 in Austria, Germany, and Switzerland. Their data showed that the lockdown reduced the mismatch between social and biological sleep-wake timing as people began working from home more and sleeping more regular hours from day to day. People also slept about 15 minutes longer each night. However, the self-reported data indicated a perception that sleep quality had declined.