Michael Perlis of the Perelman School of Medicine said it’s normal for sleep to suffer under stressful circumstances, such as a pandemic. “Evolution or God programmed us not to sleep when there’s a perceived threat,” he said. “If you have a lion looking at you and licking its lips, you shouldn’t go to sleep.”
https://www.latimes.com/business/story/2021-07-13/coronavirus-pandemic-insomnia-how-to-fix-it Los Angeles Times