While longer naps could be an early symptom of Alzheimer’s disease, shorter naps are more and more being associated with larger total brain volume. This means that those daytime winks you love so much may actually protect against brain shrinkage as you age.

Urban air pollution, mostly from vehicles, is associated with an increased risk of dementia, a research says.

Long-term use of certain anti-depressants is linked to dementia in a large British study, researchers say, though they could not definitively conclude that the drugs are the cause.