@article {laffan2010utility, title = {Utility of sleep stage transitions in assessing sleep continuity}, journal = {Sleep, PMCID: PMC2982738}, volume = {33}, number = {12}, year = {2010}, pages = {1681}, issn = {0161-8105}, author = {Laffan, A and Caffo, B and Swihart, B and Punjabi, N} }