1. Department of Somnology, Tokyo Medical University, Tokyo, Japan
2. Department of Life Sciences and Bioinformatics, Division of Biomedical Laboratory Sciences, Graduate School of Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan
3. Department of Psychology and Humanities, Edogawa University, Chiba, Japan
4. Sleep Research Institute, Edogawa University, Chiba, Japan
5. Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan