How Covid-19 Affects the Brain, During and After Sickness

The virus’s mental health impact may mean a secondary epidemic

Illustration: Simone Noronha

Once Katie Swanson’s lips and eyelids turned blue, she stopped being able to sleep. The 28-year-old has always been “great at sleeping,” she says — an early-to-bed and early-to-rise type of person — but the coronavirus had her oxygen levels cratering, and she…