Vahratian said the survey didn’t try to determine what might be driving menopause-related differences in sleep.

But Dasgupta noted that, on top of various menopause-linked symptoms, changes in estrogen levels, as well as health issues that come with age, might also play a role.

“Estrogen helps out with muscle tone in the upper airways, and the loss of that contributes to obstructive sleep apnea risk,” he pointed out. “Insomnia risk also goes up as we age, along with restless leg syndrome, which interferes with falling asleep. Also as we age, heart failure, lung disease and psychiatric disease risk goes up, and medications to treat these can boost insomnia and the need to go to the bathroom at night.”

So what’s the advice to America’s bleary-eyed women?

“Number one, don’t smoke,” said Dasgupta. “And for women experiencing hot flashes, wear loose clothes and monitor the room temperature for comfort. Also try and establish good sleep ‘hygiene’ — meaning having a defined bedtime and wake time. And, of course, always reach out to your doctor for help.”