Coronavirus makes people act out dreams in their sleep.
Scientists have recorded a spike in dream reenactment disorder in those who have suffered from COVID-19. The condition is an early indicator of Parkinson's disease and experts are trying to figure out how much the virus changes the brain.
The scientists studied more than 26,000 people from across 15 countries.
Professor Yaping Liu, who led the research at the Chinese University of Hong Kong, said: "We found dream reenactment behaviour was two to four times higher than previous studies.
"Moreover, in those subjects who reported a COVID-19 diagnosis, it was two or three times higher, compared with subjects without infection."
Liu added: "They may punch or flail their arms in the air, make running movements or even jump out of bed, sometimes resulting in injuries."