Taking too long to enter the phase of sleep in which we dream may be an early sign of Alzheimer's disease. This is the conclusion of an international team of researchers who studied the sleep patterns of around 100 patients with either Alzheimer's or its precursor in comparison with their cognitively healthy counterparts.

Scientists have uncovered a potential link between delayed REM sleep and Alzheimer's disease. A new study shows that individuals who take longer to enter the dream phase of sleep may be at higher risk of developing the condition.