go to http://www.indegene.com/Ent/Jour/indJour_LARY_Sum_01-11-2001_1.asp

for some very helpful data. The abstract from Medline (which is public and free):


The Occurrence of Sleep-Disordered Breathing Among Patients With Head and Neck Cancer

Michael Friedman, MD; Roee Landsberg, MD; Shepherd Pryor, BS; Zubair Syed, DO; Hani Ibrahim, MD; David D. Caldarelli, MD
From the Department of Otolaryngology and Bronchoesophagology, Rush-Presbyterian-St. Luke