Bed sharing bad

On average, couples who share a bed suffer 50% more sleep disturbances, a study conducted by the University of Surrey found. If you think about it evolutionarily, the marital bed only began during the industrial revolution, when people moved into overcrowded urban areas. Before the Victorian era couples regularly slept apart. In ancient Rome the marital bed was only for making love. So I guess it would seem natural that we would experience problems sharing a bed.