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Even a mild case of COVID-19 can cause people to have trouble sleeping, according to new research.

It was already established that sleep problems were associated with COVID-19 for patients whose illness was bad enough to require hospitalization, CBS News reported. This study aimed to see if people with mild cases are similarly affected.

The research from Vietnam was published in Frontiers in Public Health.

The project involved 1,056 COVID-19 patients who were not hospitalized. They were assessed for insomnia, depression, and anxiety. Researchers found that 76.1% of them had insomnia—and 22.8% had severe insomnia. Head over to WebMD to read the full story.