From: hound23x@gmail.com   
      
   Poor Sleep Tied to Brain Changes of Dementia   
      
   By NICHOLAS BAKALAR   
   DECEMBER 15, 2014   
   Poor sleep in older adults may be linked to brain changes associated with   
   dementia, a new study has found.   
      
   Researchers studied 167 men who underwent sleep tests in 1999 and died by   
   2010. The study, in Neurology, recorded sleep duration, periods of waking up   
   and episodes of apnea, and used pulse oximetry to measure oxygen saturation of   
   their blood.   
      
   On autopsy, they found that those in the highest one-quarter for duration of   
   sleep at oxygen saturation of less than 95 percent were almost four times as   
   likely to have higher levels microinfarcts, small areas of dead tissue caused   
   by deprivation of    
   blood supply, as those in the lowest one-quarter.   
      
   Compared with those in the lowest 25 percent for duration of slow-wave (deep)   
   sleep, those in the highest one-quarter were about a third as likely to have   
   moderate or high levels of generalized brain atrophy.   
      
      
   "Prior studies have shown an association between certain types of sleep   
   disturbance and dementia," said the lead author, Dr. Rebecca P. Gelber, an   
   epidemiologist with the Veterans Administration in Hawaii. "These lesions may   
   help explain the association."   
      
      
   http://mobile.nytimes.com/blogs/well/2014/12/15/poor-sleep-tied-   
   o-brain-changes-of-dementia/?referrer=   
      
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