I think dreams are so inter related to our everyday experience that having them can have a profound effect on our general disposition for awhile. I think dreams reflect the anxiety we experience. From my own experience if i am very anxious then the dreams seem to double that experience. It as if i were talking to myself in my sleep through my dreams and enforcing the anxiety the anxious state of my mind.
Then there are the dasaviews that i have had. It is weird because i about 5 of them in the last 10 yrs. So when i have a bad dream , i am thinking in my sleep i hope this is not a dasaview. OK so i am supper sensitive, give me the benefit of the doubt. Any way what has helped me is getting my heart in a joyful state before going to sleep which for some reason helps in not having night mares. Maybe what i am saying is that some kinds of dreams come from a mind that is kinda lazy in controlling the thought life , so the mind is going to go astray in our sleep. If we could take captive every thought then maybe what anxiety we are going through would be lessened and we would not be so upset in our sleep so that we make our dreams an outlet.
And then there is the spiritual aspect of dreams, could we be attacked by Satan in our dreams? Just because we have a holy thought life does not keep us from having nightmares. We could be going through some changes of our circumstances, and we could be going through some trials with people ,circumstances, or the death of a loved one. So there is a real possibility that it could be an evil attack on our minds. Well the faster we wash our minds out wit h the word the less the night mares will hang around. The psalmist considered feeling safe to include in our sleep. So he meditated himself to sleep and the first thought from his mind was in meditation. He even meditated in a light sleep. That shows that there is a real struggle spiritually even in our sleep.