The left side of the bed is the side that is to the left when you are lying down on the bed facing up. According to various studies, people who sleep on the left side of the bed tend to be more confident and calmer in a crisis than their partner. They are also more likely to have a positive outlook and be cheerful. However, it is important to note that the left and right sides of the bed are relative to the perspective of the person lying down, so what is considered the left side for one person may be the right side for another.