Falling/jumping dreams are common I think. There is no "normal" dream, you dream what you need to dream to keep your head/self as healthy and balanced as possible. "Descent" often means going from head down into to emotions or "body" so maybe you are experiencing sudden emotional/mood changes? Opposite could be true too; maybe you're staying too much in your head/imagination instead of being down in "real" life. Lots of people have flying dreams too (I never have). Maybe you're trying to learn to fly :-) Most flying dreams people describe as amazing.

I use to have really weird/upsetting dreams when I was in therapy the first time (in the 1970's and 80's) and realized that if I didn't have the difficult dreams at night, I wouldn't be able to function during the day, would have been too anxious, etc. When I had my most recent therapy, I worked with the dreams in therapy and they were extremely helpful to me, working on my issues, letting me know what needed working on.