About a quarter of people who are married or live with someone say that they've lost sleep because of their bed partner, according to a 2005 National Sleep Foundation survey.
And one of the biggest culprits -- unsurprisingly -- is snoring.
"Today" show viewers sent in video snapshots of what keeps them up at night. And while the results, seen in the clip above, are easy to laugh off, snoring can actually be serious.
Snoring "can be a sign of something more serious, called sleep apnea," said Eric Cohen, M.D., an obstruction of the airways that can cause a snorer to stop breathing, sometimes hundreds of times a night.
"Your body has to work harder, your heart has to work harder," Cohen said about sleep apnea, which can lead to health concerns like increased risk of depression, diabetes and heart attack.
Luckily, there are some simple lifestyle measures that can help quell snoring. Watch the clip above to find out what works and what doesn't.