Hi, NOted the history about your wife has snoring for a long time, sleep apnoea and now started talking in her sleep; her Father had dementia. Snoring itself indicates that there is a structural cause that is causing such symptoms hence I would advise you the following in such a case: Take her to the ENT Surgeon who is specialized into sleep apnoea study and surgery. She may need sleeping Endoscopy to know the things that flutter causing snoring, the cause of sleep apnoea and thus get a correct guideline for further management whether needs to sleep apnoea devices as minor cases get alright with it or needs surgical correction. A proper MRI study also helps. Another reason is obesity, it causes apnoea and can be treated well if one loses weight to have normal BMI. Avoid oil and spicy foods. Anemia can add on to the problems hence should be corrected if present. Local nasal problems like hypertrophied turbinates and deviated nasal septum too cause the problems hence one has to evaluated these possibilities and get operated if needed. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T. Chandrakant, General Surgeon