hi there. I've been reading about people who've had dreams of walking through doorways, or tunnels, some hidden and some quite vivid.
Doors from a dream symbol, can mean opportunity, or it can mean, something not yet readily available if not opened. From a metaphysical or spiritual point, doorways that lead to more sinister places, guided there by dark or silouetted people, is a manner in which angels and dark spirits, not to mention other kinds of sentient energy forms can enter into our subconscious state. Why does this happen? i believe that the knowledge of energy and energy applications that have come about in our millenium, has given rise to more subtle awareness to our own mind about doorways and accesses, which before were called nightmares, without an explanation of the cause. Now, possible causes are becomming more acceptable and recognized because of our expanding quest to understand the forces of good/evil and not otherwise specified energies. If you have dreams of being guided by unrecognized forces, you have the choice in your dream state to alter those kinds of directions, by asking the angels, prior to your sleep to guide you throughout the night.

Blessings in the Light.