Dreaming is just that dreaming....Part of your dreams can be surrounding what happened during the day, but they tend to take on a life of there own. Part of them is fantasy, part is real, part is what we need or want in our lives, and part is embellishment of our day. Even dreams around our trauma aren't totally accurate.

If you fail to remember your trauma....I will tell you what my therapist told me. (He was a trauma trained in PTSD therapist) He told me that if you can't remember your trauma or parts of it, or your life.....It's your brains way of protecting you.

Your trauma may be to hard for you to handle so it just packs it away, and you can't get to it.. There are things that he/she can do to make you recover those memories......Regression therapy is one tool that they could use. But I would caution against it. You have forgotten for a reason.