A new survey by Cotton USA survey wanted to learn what people wore under the sheets and how it affects their relationships. In the survey of 1,000 British adults, 55 percent of those who slept in the nude reported feeling happy in their relationships. That's compared to 48 percent of people who wear pajamas and 43 percent who like to put on nighties. What's more, it's folks ages 55 and older who are more likely to strip down to nothing before bedtime. Meanwhile, the survey also measured what irritates people in the bedroom. The most popular answers were stealing the covers, eating in bed, letting pets on the bed, leaving the bed unmade and tossing clothes on the floor.