SARAH MCCAMMON, HOST: In the first months of the pandemic, hundreds of health care workers across the country began recording audio diaries. They captured their thoughts and feelings as they treated patients with COVID-19. (SOUNDBITE OF PODCAST, "THE NOCTURNISTS: STORIES FROM A PANDEMIC") DAN DONOHO: It's March 26 in the afternoon, finally home after a fairly long day yesterday and today. MCCAMMON: That's Dan Donoho, a neurosurgeon in Los Angeles. (SOUNDBITE OF PODCAST, "THE NOCTURNISTS: STORIES FROM A PANDEMIC") DONOHO: Every day, when I get to go to sleep, all I think about is, did we do en...