Source: The Great Interpretation of Dreams (Ibn Sirin)
Ascending to heaven in a dream indicates gaining authority and exaltation with danger and arrogance. If he does not return, he dies. If he ascends with a ladder, he gains security and exaltation.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Ascending to heaven indicates drawing closer to God or the ruler. For the sick, it is death.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Ascending to heaven is interpreted as exaltation and prestige. Whoever sees himself ascending will attain exaltation.