When you wake up with a feeling of fatigue, although you have slept the recommended time, this may be a sign of a worsening of the brain.
After monitoring the sleep of 119 people over the age of 60 and practicing brain scanners, a group of scientists found that those with less sleep of slow waves – the deep sleep needed to consolidate memories and wake up the refreshed – a higher level. brain protein.
The increase in this substance is a sign of Alzheimer's disease and is associated with brain damage and cognitive decline in other diseases.
The new study is one of the first to link the quality of sleep – not quantity – to Alimeter. It is important that this disease occurs for up to two decades before symptoms appear, so the challenge is to reach an early diagnosis. In this respect, new work shows that sleep quality can be a useful marker.
The results were published yesterday in the journal Science Translational Medicine.
In an interview with El Mercurio, lead author Brendan Lucey, a professor of neurology at the University of Washington, USA, commented: "We believe that changes in the brain caused by the disease, in particular the accumulation of tau, stop sleep activity soon after the start of problems with think and remember. "
The same is the opinion of Claudia Hetz, director of the Instituto Milenio de Neurociencia Biomdica (BNI).
"Probably the problem of sleeping is an unwanted effect of the alzheimer," agrees Hetz.
"This is an important result; it's ridiculous that sleep changes can be measured and given a red light, which may be the time to go to a neurologist." And he adds: "Probably this type of measurements, together with other molecular, will help predict the risk".
Lucey adds that the study of dreams (slow waves) is the deepest phase of the NREM phase (see frame) and its changes can be manifested by awakening at night, but they may also be slightly noticeable and do not reduce sleep time.
It is therefore important that you consult a doctor if you feel that you have had a little rest, even if you are sleeping the recommended time, which is for adults seven to eight hours a day.
This is confirmed by Carolina Aguirre, the chief neurologist at the UC Christus Health Network Sleep Center.
"The study you're talking about is that if I'm asleep for eight hours or more, but I wake up tired, you have to consult."