Explain why you fell in your dreams.

This is actually an illusion caused by physical weakness or potential worries, and your sleeping environment (nose is too close to the wall) and posture (hands on your chest) are also easy to cause such dreams. Generally, the place where you sleep is short of oxygen (for example, burning a stove leads to high exhaust gas content), which will produce a sense of powerlessness.

The main reason why I want to scream but there is no sound is that I am already in a light sleep state, and my consciousness can be vaguely felt by my subconscious, but my brain can't effectively command my limbs, so I feel as if I have no strength.

Sometimes when I dream of fighting, I usually run away, which is usually the reason.

If you are worried about something, think about what makes you feel uneasy or afraid recently, and then try to solve it.

Relatively speaking, if your environment is ok, I suggest that you put subconscious hypnotic language prompts at night, which will reduce these nightmares.