People who sleep on the left-side of a double bed lead a positive, happier and comparatively stress-free life.

While people who sleep to the right tend to earn more, those who sleep on the left are happiest at work and were more likely to be in permanent employment and better at tackling heavy workload.
Spokeswoman for Premier Inn, Claire Haigh said, "The research clearly indicates a pattern between which side of the bed you sleep on and the mood you wake up in."
Source-Medindia