Dreams, subconcient images (Gilgamesh IV & V)

Gilgamesh and Endiku set out to look for and defeat Huwawa. Throughout the journey, the differences between both of the characters got notorious. Gilgamesh, turned out to be very religious and loyal to the gods, offering flour and saying- "May the mountain bring a fortunate dream from Shamash" (p.21) Endiku, on the other hand turned out to be very skilled and knew hot to survive in the wild- "Endiku, born in the wilderness, made a shelter." (p.24)
At night, Gilgamesh kept having dreams which woke him up. When he asked Endiku what they meant, he said they were fortunate. These dreams are a tool the author uses to tell the reader what will happen later on.
I started to think about the meaning of dreams. This is a very complicated theme to look at because humans hace very little knowledge about it. The way I see it, dreams are messages from the brains, either reminding you about something, or showing an image that will help you later on. Dreams are like files in a computer. When you sleep, I think, your brain starts putting together those files and that's how dreams are made.
They say you can never have a dream in which you die. Personally, I have dreamed things that put in real life, would end with my life, but I have never died in any dreams. Questions I have in mind are- Why don't you die in dreams? Why do you remeber some dreams and forget others? I decided to keep a "dream journal" in which I record the dreams I remeber and try to find some pattern.