Meaning of dreaming of jungle or forest depends on the situation as per dream interpretation. If you simply dream of jungle then it means that soon you will enter into a phase of life where it will be impossible for you to determine between what is right and wrong. Basically you will be confused as to what you need to do.
Dreaming of going into forest means you will be giving up or retiring. It is also a sign of defeat. It also means you might willingly give away something.
Dreaming of you running in forest means you will soon face emergency situation in life.
Dreaming of you lying down in forest means you will get opportunity to take a break from hectic life.