It is possible to tell how happy a couple is together by measuring the distance between them as they sleep, scientists said. (Agencies)
The research carried out by University of Hertfordshire psychologist Professor Richard Wiseman, involved asking over 1000 people to describe their preferred sleeping position and to rate their personality and quality of their relationship.
The research revealed the most popular sleep positions for couples, with 42 percent sleeping back to back, 31 percent sleeping facing the same direction and just 4 per cent spending the night facing one another.
In addition, 12 percent of couples spend the night less than an inch apart whilst 2 per cent sleep over 30 inches apart.
"One of the most important differences involved touching, with 94 percent of couples who spent the night in contact with one another were happy with their relationship, compared to just 68 percent of those that didn't touch," Wiseman said.
The further apart the couple spent the night, the worse their relationship, with 86 per cent of those who slept less than an inch apart from their partner being happy with their relationship, compared to only 66 per cent of those who slept more than 30 inches apart.
The work also revealed that extroverts tended to spend the night close to their partners, and more creative types tended to sleep on their left hand side.
"This is the first survey to examine couples' sleeping positions, and the results allow people to gain an insight into someone's personality and relationship by simply asking them about their favorite sleeping position," Wiseman said.
It is possible to tell how happy a couple is together by measuring the distance between them as they sleep, scientists said.