Rejoicing Dead
Scholars have said that seeing the dead rejoicing and happy in a dream may indicate the dreamer's good standing with Allah, as the dead are in the realm of truth. However, seeing them not rejoicing or turning away might indicate the dreamer's poor standing with Allah, citing a prophetic narration that a dream can be an admonition.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam