1. Centre for Advanced Research in Sleep Medicine, Hôpital du Sacré-Cœur de Montréal, Montreal, Quebec H4J 1C5, Canada
2. Department of Psychology, Université du Québec à Montréal, Montreal, Quebec H2X 3P2, Canada
3. Department of Neurology, Montreal General Hospital, Montreal, Quebec H3G 1A4, Canada
4. Department of Psychiatry, Université de Montréal, Montreal, Quebec H3C 3J7, Canada
5. Research Centre, Institut universitaire de gériatrie de Montréal, Montreal, Quebec H3W 1W5, Canada
6. Department of Psychology, Université de Montréal, Montreal, Quebec H2V 2S9, Canada
7. Department of Radiology, Radio-Oncology, and Nuclear Medicine, Université de Montréal, Montreal, Quebec H3T 1A4, Canada
8. Departments of Clinical Neurosciences and Radiology, and Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta T2N 4N1, Canada