Broken sleep in your 30s and 40s could lead to Alzheimer's years later, study shows

People aged in their 30s and 40s who suffer from poor-quality sleep could experience memory and cognition problems much later, a study has shown.

Participants who had the most disrupted sleep were twice as likely to see a decline in their cognitive performance as those with the least interruption, the study, published in Neurology, said.