Here’s a reason to head to bed earlier. U.S. researchers surveyed nearly 3,000 healthcare workers from a few European countries and the U.S. They found the risk of catching COVID was greater for those who had trouble sleeping and those who were “burned out” by their job. In fact, every one-hour increase in the amount of time spent asleep at night was associated with 12 percent lower odds of catching COVID. One notable find, though, was that an extra hour of daytime napping was associated with six percent higher odds of being infected with COVID. And compared to those without any sleep problems, those who reported difficulties in falling or staying asleep, or needed to use sleeping pills, had an 88 percent greater risk of contracting COVID. Researchers theorize that lack of sleep and sleep disorders can influence the immune system, increasing inflammatory molecules.