Can Treating Sleep Apnoea Sharpen the Adult Mind?

Obstructive sleep apnoea has been tied not only to daytime fog but to a heightened long-term risk of dementia. Whether treating it with CPAP can protect or restore thinking has remained contested. This meta-analysis tackled the question by pooling only randomized controlled trials — the gold standard for cause and effect — combining 14 studies and 1,926 participants.

By restricting the analysis to randomized trials, the authors filtered out the weaker evidence and focused on studies where treatment was assigned by chance, isolating CPAP's effect on cognition from the many other factors that influence how well a person thinks. The result is a more trustworthy estimate of what restoring nighttime breathing does for the adult brain.

This matters because it extends the project's central thesis across the whole lifespan. The same airway compromise that shapes a child's developing face and behaviour continues, in adulthood, to tax the brain night after night. Showing that treatment can move cognitive outcomes underlines that the airway is not a fixed liability — it's something worth opening at any age.