The risk of lack of  sleep on memory  
The Assembly of Neurology  German in Berlin that the low rate of deep sleep is responsible for the  decline in memory in the elderly.
It pointed out that deep  sleep is important to enhance memory, emphasizing that the sleep  patterns of people change over the years, as the youth at the age of  twenty-fifth or less spend 19 percent of their sleep in a deep sleep and  would decrease by about 3 percent between the ages of thirty-sixth  session.
The Society stated that  young people spend more than an hour in a deep sleep during the first  half of the night, where sleep deeply completely, while that for the  elderly in the deep sleep 18 minutes only, and those who suffer from the  continuing unrest in the sleep periods are sleeping deep short and  damage the mental ability to  store what they have learned in their waking hours. 
 
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