Scientists Reveal the Optimal Amount of Sleep to Lower Dementia Risk

York University researchers pooled 69 studies covering nearly 4.5 million people.

Sleeping 7 to 8 hours a night was linked to lower dementia risk.

Regular physical activity and less sedentary time were also associated with lower risk.

Sleeping under 7 hours or over 8 hours, along with prolonged sitting and low activity, was linked to higher risk.