Medical Notes: Week of December 29, 2019

A look at the top medical headlines for the week of December 29, 2019, including: The last three flu seasons have been bad, but there’s a chance this year could be even worse. Then, sleeping too much can be a risk factor for stroke. Plus, more than 30 million people in the United States think they’re allergic to penicillin when they’re not. And finally, if you’re scheduled for surgery, ask your doctor what kind of music she listens to in the operating room.