The Mannheim work psychologist Sabine Sonnentag studies how people recover from work. Research links Abschalten, switching off mentally after work, with less tiredness the next morning. In 2019 Sonnentag and colleagues published a study of 151 employees in the Journal of Management. It found that people also need to reconnect mentally with their work at the start of the day. This tuning in, Einstimmen, goes together with activating work-related goals.