1. German Aerospace Center, Institute of Aerospace Medicine, Sleep and Human Factors Research, Linder Höhe, 51147 Cologne, Germany
2. ZEUS GmbH, Zentrum für Angewandte Psychologie, Umwelt- und Sozialforschung, Sennbrink 46, 58093 Hagen, Germany
3. Institute for Communication Science, Friedrich-Schiller University Jena, Ernst-Abbe-Platz 8, 07743 Jena, Germany
4. Working Group Biostatistics, Institute of Medical Biometry, Informatics, Epidemiology (IMBIE), University of Bonn, Venusberg-Campus 1, 53127 Bonn, Germany