Those who have a tendency to migrate to the left of a double bed are apparently happier than their ‘right’ counterparts.
The study of 3,000 adults found that that those who sleep on the left are generally more cheerful, but they are also more positive and capable of tackling heavy workloads and a stressful day ahead.
More than a quarter of people who snooze on the left side of the bed feel they have a really positive outlook on life in general, compared to 18 per cent of right-side sleepers.
The upbeat morning mood of ‘lefties’ may also go as far to explain why more than half of them refuse to swap sides with their other half.
Almost a quarter of the nation is convinced there is a wrong side of the bed and more than 75 per cent of Brits are so stuck in their sleeping routine that they would find it strange to sleep on the other side of the bed.
Two-thirds of those who doze on the left reckon they are calmer than their partner in a crisis. They also tend to have more confidence and for this reason are more likely to be in permanent employment.
In addition, 31 per cent of ‘lefties’ love their job compared with just 18 per cent of ‘righties.'
However it is not all bad. Those who sleep on the right side of the bed tend to earn more than their left equivalents.
Claire Haigh spokeswoman for Premier Inn, who commissioned the research, said: 'The research clearly indicates a pattern between which side of the bed you sleep on and the mood you wake up in.
'Left sleepers are more cheerful, appear to enjoy life slightly more and have a more positive attitude to the day ahead than right sleepers.
'It comes down to habit and what you're used to. If you are used to sleeping on a certain side of the bed, it does feel a little alien when you switch.
'So it seems the age old saying about getting out of bed on the wrong side is completely true.'