One in three Americans doesn't get enough sleep, and 45% of the world's population doesn't either.
원문출처 : http://www.cnn.com/2017/07/05/health/alzheimers-sleep-dementia-study/index.html
원문출처 : http://www.cnn.com/2017/07/05/health/alzheimers-sleep-dementia-study/index.html