1. Department of Psychology, Center for Brain Science, Harvard University, Cambridge, Massachusetts, United States
2. Centre for Sleep & Cognition and Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore
3. Department of Psychiatry, Massachusetts General Hospital, Charlestown, Massachusetts, United States
4. Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States