Abstract: Dream and sleep study is one of considerable subjects in investigations on Iran’s social and political history. Dream besides importance as an event can be analyzed and interpreted as a text. Therefore, in this study we aim to investigate hidden definition of dreams while analyzing symbols and signs in Safavid and Qajar era dreams. This study achievements point out to class and its effect on functional aspect in addition to functions such as: remedial, apological, forecasting and innocence. Comparison of Safavid and Qajar dreams while show functional commonalities of these two eras, reveal Qajar distinction because of critical functions in intellectual dreams. A descriptive-analytical approach is taken to study data.