Source: The Great Interpretation of Dreams (Ibn Sirin)
The horizon in a dream indicates hope and expectation. A clear horizon indicates the fulfillment of wishes. A cloudy one indicates despair.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
The horizon indicates a distant journey. Looking at it indicates waiting for someone absent.
Source: Signs in the Science of Expressions (Ibn Shaheen)
The horizon is interpreted as news. If it is bright, it is good news. If it is dark, it is bad news.