Dreams that involve crying are the psyche's mechanism for emotional processing. Tears that cannot be shed in waking life often find release in the dream world.
Positive Resonance
Emotional release, grief honored, deep feeling, healing through expression
Shadow Aspect
Unprocessed grief, emotional suppression in waking life, bottled feeling
Nuances
Crying alone: private grief
Others crying: empathy or their pain
Unable to cry: emotional block
Crying with relief: resolution
Crying without knowing why: unconscious grief releasing