HI I have gone through your mail, as you said that your husband undergone esophageal stricture surgery but you have not told about cause of stricture ( oesophagitis / ulcer / neoplastic ),but if blood is found in phlegm means something wrong, as for as snoring and sleep apnea is concern it is mainly caused by obstruction ( physical / functional ) any of place of upper respiratory tract means from nasal cavity to larynx.you are now advice to contact your E.N.T.specialist for physical examination of nose, oral cavity, oropharynx, palate and larynx to find out the actual site and do sleep study to diagnose the severity of disease and than plan for management. Thanks.