In this manuscript we give an overview of observational sleep research with a particular emphasis on sleep stage transitions. Sleep states represent a categorization of sleep electroencephalogram behavior over the night. We postulate that the rate of transitioning between sleep states is an important predictor of health. This claim is evaluated by comparing subjects with sleep disordered breathing to matched controls.
Caffo, Brian S.; Swihart, B.; Laffan, A.; Crainiceanu, C.; and Punjabi, N., "AN OVERVIEW OF OBSERVATIONAL SLEEP RESEARCH WITH APPLICATION TO SLEEP STAGE TRANSITIONING" (March 2008). Johns Hopkins University, Dept. of Biostatistics Working Papers. Working Paper 168.