1. Japan Society for the Promotion of Science, Kodaira, Japan
2. Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Japan
3. Occupational Stress and Health Management Research Group, National Institute of Occupational Safety and Health, Kawasaki, Japan
4. Ergonomics Research Group, National Institute of Occupational Safety and Health, Kawasaki, Japan
5. Department of Clinical Psychology and Psychobiology, University of Barcelona, Barcelona, Spain
6. Institute of Neurosciences, University of Barcelona, Barcelona, Spain