Crosswords also caused less brain shrinkage (measured with MRI), seen after 78 weeks.
The Australian research team found the blood pressure treatments all reduced the risk of dementia.
"I flew through the first 4,000 seats - but then the pain kicked in."
The findings are based on electronic health records of 559,106 US veterans people diagnosed with type 2 diabetes between January 2000 to December 2019.
The study included more than 590,000 patients.
The findings are based on 412 former Scotland internationals aged at least 30 by the end of 2020.
The study involved more than 21,000 men and women across the USA.
Regular visits to the dentist may help prevent dementia.
"These three studies show worrying associations between obstructive sleep apnea and important diseases that affect survival and quality of life."
The study offers hope.