Art by smbc-comics
Consciousness is often said to disappear in deep, dreamless sleep. We argue that this assumption is oversimplified. Unless dreamless sleep is defined as unconscious from the outset there are good empirical and theoretical reasons for saying that a range of different types of sleep experience, some of which are distinct from dreaming, can occur in all stages of sleep.
Pubmed Articles
Does Consciousness Disappear in Dreamless Sleep?
Sciencealert Article We Were Wrong About Consciousness Disappearing in Dreamless Sleep, Say Scientists
I remember I've had dreams but I only have a very vague sense of what they are about.
Agreed. In my experience, dreams can be interpreted much like art can be interpreted. How you emotionally respond to the images and scenarios tells you a lot about what your mind is attempting to deal with while you are physically safe. I believe that dreams are a form of poetry that your mind is engaged with in order to integrate life experiences in a safe manner.