TY - BOOK AU - Islam Samir Mohamed Badreldin AU - Ahmed Abdelaal Morsy , AU - Mohamed Emad Mousa Rasmy , TI - From sleep staging to sleep quality assessment : : Measuring sleep restoration gain via modeling the latent processes of sleep / PY - 2012/// CY - Cairo : PB - Islam Samir Mohamed Badreldin , KW - Machine learning KW - Sleep quality KW - Sleep staging N1 - Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of System and Biomedical Engineering; Issued also as CD N2 - Sleep is a physiological process by which the body restores its vitality , wellness and efficiency . The restorative ability of sleep is related to its depth and structure . Sleep staging is the clinical practice of identifying the depth and structure of sleep . In the sixties of the last century , Rechtschaffen and Kales ( R & K ) set the sleep scoring guidelines so as to standardize the terminology , techniques and the system used by sleep scorers ER -