Most of the time, people who work during the week sleep and wake earlier on weekdays than they do on weekends. This is called social jetlag and it leads to poor sleep. Scientists from the University of Basel said the lockdowns made people sleep longer and at healthier times, so there was less social jetlag. They said this was because even people who still worked did so from home, so they did not have to get up early to travel to work. They also found that people did not sleep as well because they were worried.