From a psychological point of view, it is best to sleep in a bed every day, so that once a person sleeps, it is easy to feel lost psychologically, and even likely to lose dependence. You just feel that you have been in a mess all your life, and you hope that the other party can find them. If you wait too long before you leave the bed, this feeling will fade away, so the dependence between husband and wife will be like this.
From a scientific point of view, if two boards are put together with the mattress, they are fixed together, so it is easy to have an unstable self. If the floor is uneven, then two wooden boards or mattresses are the same style, which in itself is prone to height difference or skew, and the position is actually easy to adjust externally, so sleeping in the middle will definitely be uncomfortable. Couples sleeping together will definitely avoid the gap in the middle, so naturally, the two couples will sleep on one side, and it is easy to have the feeling of sleeping in separate beds slowly. If they are forced to sleep together, it will not only make people feel uncomfortable, but also affect the quality of sleep for a long time, and it will also lead to discomfort or emotional instability. In fact, it is easy to have the side effect of losing your temper, and your feelings will naturally be threatened.