Source: The Great Interpretation of Dreams (Ibn Sirin)
Sitting in a dream indicates stability and comfort. Sitting on a chair indicates exaltation and position.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Sitting indicates having control of a matter. Whoever sees himself sitting on the ground, his affairs will stabilize.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Sitting is interpreted as comfort. Whoever sees himself sitting will attain comfort.