What does it mean to dream about tunnel?
A tunnel often pictures a passage through a hard or narrow stretch, with the light at the end standing for the hope of coming out the other side.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read a birth passage and the body, the narrow way one must pass through.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung would see a transition through the unconscious, the dark corridor of a rite of passage toward what waits beyond.
Jungian concept (our summary).Modern
Continuity ties tunnels to waking experiences of being in the middle of a difficult process with no exit yet in view.
Continuity hypothesis (our summary).Mythological
The descent through a passage into the underworld and back is a core mythic journey, the dark way that must be walked to be reborn.
Rosmerta Publishing editorial synthesis (after Bulfinch).