1 Department of Family Health Care Nursing, UCSF School of Nursing, University of California, San Francisco, Box 0606, Room N411Y 2 Koret Way, San Francisco, CA 94143-0606, USA. Electronic address: Kathryn.Lee@ucsf.edu.
2 Human Sleep Research Program, Center for Health Sciences, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA. Electronic address: Fiona.baker@sri.com.