An adequate and restful dream is very important to feel good and rest.
During sleep, for example, they release growth hormones, which are, among others, responsible for the regeneration of the muscles.
In addition, they release hormones during sleep, which increase body temperature and promote deep sleep and resubmit the important messenger substances in the immune system.
However, those who frequently make nighttime sleep too short will increase the risk of suffering from illness. But not only the duration, but also the quality of the dream is important for an organism that works in an optimum way.
According to a recent study by the Faculty of Medicine of the University of Washington at St. Louis, the poor sleep quality is related to an increased risk of Alzheimer's.
It is not yet clear, if the bad dream is simply an indication or responsible for dementia.
Bad dream as an indicator of Alzheimer's?
Scientists wanted to use their study to find out if the duration and quality of the sound affect the production of so-called tau proteins. It is considered that this protein is one of the main causes of dementia.
For this, the research team examined the behavior of the son of a total of 119 subjects over 60 who did not have a cognitive impairment.
The subjects carried an EEG device (electroencephalography) on the forehead for a week to measure brainwaves during sleep. In addition, a special wrist strap registers the bodily movements of the subjects.
In addition, the participants maintained a sound diary, where they recorded their sleep time, both in the evening and in the afternoon, in writing.
At one week, scientists used the so-called PET test to check the amount of tau proteins in the brain and the spinal cord of the subjects.
The quality of the sound is more important than the duration
The results of the study were clear: subjects with less deep sleep periods showed a higher concentration of tau proteins. In deep sleep, the so-called REM sound phase, pulse, respiration, and blood pressure and brain activity change.
"Interestingly, on the one hand, people with less deep sleep periods had more tau proteins in the brain but, on the other hand, they had no mental limitations," said Brendan Lucey, of the Medical Center of the Dream and head of studio.
"The deep sleep reduced can be a sign of transition between normal and deterioration," says Brendan.
The results of the study also show that the quality, but not the duration of sleep, has an effect on the amount of tau proteins in the brain and, therefore, is related to Alzheimer's disease.
However, researchers still do not know if deficient sleep is just an indication of incipient or even illness.