Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society
Read whichever section(s) that is of interest to you (for those interested in depth). (120 minutes)
National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health - 2006
Click http://www.ncbi.nlm.nih.gov/books/NBK19960/ link to open resource.