A study led by Professor Richard Wiseman, a psychologist of the University of Hertfordshire found that couples who sleep less than an inch apart are more likely to be happy in their relationship than those maintaining a gap wider than 30inches.

The survey of more than 1000 people which was conducted as part of the Edinburgh International Science Festival in 2014 also found that couples who made physical contact through the night were happier than those who made no contact while sleeping.

“One of the most important differences involved touching,” Professor Wiseman is quoted as saying by The Telegraph. “Ninety-four percent of couples who spent the night in contact with one another were happy with their relationship, compared to just 68% of those that didn’t touch.

“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 favourite sleeping position.”

The researchers also found that if you have a partner who used to sleep close in bed but now sleeps further apart in bed, that could signal your partner is drifting away from you.