Whether you’re dealing with the common cold, the flu or a stomach bug, you’ve probably noticed that your symptoms feel worse at night.
You’re not imagining things. Research suggests that your body’s circadian rhythms—as well as some other factors—can exacerbate your symptoms after sundown.
Along with regulating your sleep, your body’s circadian clocks help manage your immune system, says Michael Smolensky, a biological rhythm researcher and adjunct professor of biomedical engineering at the University of Texas.
