Simple dream question?

Question

how come sometimes we don't remember most of our dreams...wen other dreams seem so real and vivid...and other times we have dreams and we just forget them?

Answer 1

The theory I have heard most commonly is that dreams occur to diminish anxiety while we are sleeping. In this case, when we do not remember dreams, they are serving their purpose properly. Remembering dreams, especially anxiety-provoking ones would indicate that the dream has failed, probably due to increased anxiety. The intensity or vividness of the dream might depend on one's own chemistry, or maybe even influenced by several various factors, such as what one ate, the temperature, etc.