Not all dreams are physical or somatic in nature, just as some are not purely soulish in nature.
Some dreams are very spiritual.
For example, I know an elderly Russian emigre, who periodically has dreams in German, where he will read/quote aloud while asleep poems written by Goethe. BTW, he doesn’t know German, except perhaps a few phrases from Hogan’s Heros or what they learned in the war such as “hands up”, “Stop”, or Heil Hitler. Later he would pick up books in German and be able to read them, even though he had never had any education in German.
I myself have had dreams in Hebrew and Aramaic of which I never even knew the alphabet, but able to later recall and write, then search for alphabets with the same characters.
Additionally there are a category of dreams known as vivid dreams to those who recall them, in which the dreamer is receiving perceptions more vivid than normal life, including a body, heightened physical senses, cognizance of other persons, reasoning ability to construe logical arguments mentally before deciding to act, and with volition to act in the dream. I would categorize such dreams as more spiritual in nature. Interestingly enough, many of these spiritual dreams might involve persons other than the dreamer as evidenced to the dreamer by their expressing thoughts or ideas which had never dawned on the person dreaming before.
Some screenwriters in Hollywood express their relationships to their ‘muse’ or spiritual influence which gives them ideas upon which to write entire story lines.
We are told in Scripture that man was originally created in body, soul, and spirit. Each has a different system of perception. The body has the commonly understood five senses of sight, hearing, touch/feeling, smell, and taste. The soul has a system of perception such as rationalism. Faith is a system of perception involving the human spirit, which to those who have never exercised faith alone in Christ alone will not understand, because until that faith is exercised, God does not give them a living spirit.
Elements of the physical domain may indeed influence our thinking, just as rationalism or elements of the rational domain may influence the body. Likewise, spiritual elements may influence both the soul and mind and visa versa.
There is plenty of science to discern features of the physical domain by the use of rationalism and empiricism, but they fail to be able to account for the spiritual domain. This is probably the greatest fallacy in science which as a system of verification remains so woefully ignorant. This doesn’t preclude the believer form being able to work with body soul and spirit, thereby making full use of all those things made available to him, but the unbeliever who limits his thinking and decisions to science and rationalism fails to make use of a wealth of perception available to him in a reliable fashion.