Can obstructive sleep apnea cause dementia?

Possibly: Osa can cause chronic low oxygen in the blood and this can lead to vascular damage. It can definitely increase your risk of dementia.

No: No but osa can affect your concentration.

Yes: There have been recent studies linking osa with alzheimer's dementia. Sleep deprivation leads to an accumulation of amyloid in the brain - this has been associated with alzheimer's dementia. Chronic intermittend hypoxia is seen with osa and this is a risk factor for dementia. Osa is associated with stroke as well.

Possible: Recent studies show a statistical relationship. Another reason to seek evaluation and treatment.