What you may not know about coronavirus -- the disease that has reached pandemic proportions -- is that one of the times you are most vulnerable to contracting it is while you're sleeping. Here is how this can happen, and what you can do about it.
원문출처 : https://www.cnn.com/2020/03/12/opinions/coronavirus-vulnerability-while-sleeping-bruce-davidson/index.html
원문출처 : https://www.cnn.com/2020/03/12/opinions/coronavirus-vulnerability-while-sleeping-bruce-davidson/index.html