“If your body is fighting off an illness or infection, that can cause night sweats,” Danoff says. These night sweats can persist for days or even weeks after other symptoms have faded. So if you recently had a fever or some other bug, that could be the cause of your bedroom sweat sessions.

In another recent Menopause study, experts linked increased rates of “vasomotor symptoms”—night sweats, but also hot flashes—to a specific genetic variation in women. This gene variation is linked to a part of a woman’s brain that controls certain hormones, and may have some ties to infertility and delayed or absent puberty, says Carolyn Crandall, MD, first author of the study and a professor of medicine at UCLA. She says it’s too early to connect the gene variation with any specific health issues or risks, but more research is coming.

Night sweats are a common symptom for those dealing with an overactive thyroid, also known as hypothyroidism, Danoff says. Other hormone-. conditions—including adrenal failure—can also cause night sweats, he adds.

“Night sweats are a common side-effect of many medications,” Danoff says. He puts antidepressants at the top of that list. “Some hormone treatments, especially those . to cancer treatments, can also cause night sweats,” he says. So can diabetes drugs, which can trigger night sweats if a person’s blood sugar drops too low, he explains.