Research shows that most people do prefer a certain side of the bed. In fact, their preference can be so strong that it can cause couples to fight for their spot. This study found that nearly 20 percent of couples went to bed angry because they were forced to sleep on the wrong side of their beds.
If you have a side, research also shows that there’s usually a reason—some people, for example, like to be closer to the door or exit, while others want a better view of the TV. And of course, when you get used to a routine with one person, it can just be annoying to change it up.