But sleeping more could indicate any number of medical/health issues. He should still be seen by his doctor and given a cognitive exam, among a general check-up, and this symptom should be communicated to the doc.
Sleeping a lot is very common in the later stages of dementia. Here is a link to a site that explains in detail the stages of dementia & what to expect during each:
https://www.agingcare.com/articles/warning-signs-of-dementia-to-look-for-139753.htm
But sleeping more could indicate any number of medical/health issues. He should still be seen by his doctor and given a cognitive exam, among a general check-up, and this symptom should be communicated to the doc.
https://www.dementiacarecentral.com/aboutdementia/facts/stages/
Best of luck!