Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Crying over a dead person, if without screaming or wailing, is relief and removal of worry. If it is with screaming, it is a calamity. Whoever sees a dead person crying is in torment.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Crying over the dead indicates longing for them. It may also indicate the dreamer's regret for his shortcomings towards them.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Whoever sees himself crying over a known dead person will be afflicted with worry and sadness.