@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}
}
@article {caffo2009overview,
	title = {An overview of observational sleep research with application to sleep stage transitioning},
	journal = {Chance, PMCID: PMC2800358},
	volume = {22},
	number = {1},
	year = {2009},
	pages = {10{\textendash}15},
	publisher = {Springer},
	author = {Caffo, B and Swihart, B and Crainiceanu, C and Laffan, A and Punjabi, N}
}
@article {Caff:Swih:Crai:Laff:Punj:an:2009,
	title = {An Overview of Observational Sleep Research with Application to Sleep State Transitioning},
	journal = {Chance},
	volume = {22},
	number = {1},
	year = {2009},
	pages = {10{\textendash}15},
	author = {Caffo, B and Swihart, B and Crainiceanu, C and Laffan, A and Punjabi, Naresh}
}
