1. Department of Clinical Neurophysiology, HUS Medical Imaging Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Department of Psychiatry, University of Helsinki and HUS Helsinki University Hospital, Helsinki, Finland
3. SleepWell Research Program, Faculty of Medicine, University of Helsinki, Helskinki, Finland
4. Finnish Defence Research Agency, Human Performance Division, Tuusula, Finland
5. Centre for Military Medicine, The Finnish Defence Forces, Riihimäki, Finland
6. Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland, and National Defence University, Helsinki, Finland