People who prefer to sleep in daily periods are exposed to an increased risk of dementia according to the study.
Researchers studied a group of people over the age of 60 who had difficulty sleeping.
The study showed that these people were detected with rising amounts of "Tao" protein that accumulates in the brain and destroys nerve cells.
Accumulation of this protein shows that they suffer from Alzheimer's disease after they monitor waves of the brain with electrical devices.
The authors of the study linked sleep with sleep or a lack of deep sleep and an influence on their brain, which suggests that they are more susceptible to Alzheimer's disease.