If you have dreamed of sleeping with your sister-in-law: This period, what you will do for your family life becomes important, you may feel stuck because of the issues that remain hidden. To sleep with your sister-in-law in your dream means that your psychological problems will increase and you will not be able to make healthy decisions, you will make a big mistake, you will experience regret. It is also interpreted as the unrest that will occur in the household.