The underground normally symbolizes the subconscious. Things that are covered, interred, or that emerge from the ground represent qualities that come from the deepest part of your personality. It could be a positive or negative dream. Digging in the ground could be frightening, but sometimes it is useful in order to know secrets and hidden truths that you would otherwise miss. Further, exiting an underground tunnel and reaching the light represents a triumph over adversity. To interpret this dream it is important to pay attention to the sensations that you feel, and to the events that occur therein.
Gallery of dreams
Reading in dream
Sometimes you will not be able to differentiate lucid dream. If you want to be sure, try reading a simple sentence, if you are able to read then you are in wakeful stage if not you are in lucid dreaming. Studies show that you cannot read while dreaming or you will not find the repeated sentences one more time.
Do animals dream?
Research conducted by various scientists show that animals do experience dream while sleeping. They also experience similar sleep stages like human beings - REM and Non-REM. If you have noticed a dog sleep, it might sometimes wag its tail, this indicates some response to its dream. A study was conducted in a cat by removing a part of the brain stem, which will not prevent it from reacting to the dream during REM. It was noted in some cats they were aggressively chasing mice as in reality.