Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing a dream within a dream may be a reminder of a matter or a warning about it. Interpreting a dream within a dream may be true or false.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A dream within a dream indicates a postponed matter or distant wishes.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A dream is interpreted as worry. Whoever sees himself dreaming will be afflicted with worry.