Dream
Dream is defined as a process which takes place in a mind which can effect the reality. It is well defined in the movie.
INCEPTION
The totem is a device that Cobb spins in order to tell whether he's in a dream or not. If it spins perpetually, he's in someone's dream. If it spins, but then falls and stops, it's reality.
Yes, it is possible to see yourself die in a dream. This experience can be unsettling, but it is a common occurrence in dreams and does not necessarily reflect reality.
inception
Reality Dream was created in 2008-11.
This dream suggests that the dreamer is out of touch with reality and needs to be "grounded," that is, to face facts in real life.
It's a cliffhanger; no-one knows
This question is not entirely clear. Persons do not "get stuck" in dreams, because dreams end when the dreamer awakens. The idea that one can "get stuck" might have come from science fiction such as "Inception." Such ideas are not based in reality.
A dream within a dream is a concept where a dream is nested within another dream, creating layers of reality within the dream state. This idea challenges our perception of what is real and what is not, blurring the lines between consciousness and the subconscious mind. It raises questions about the nature of reality and the depths of our own consciousness, prompting us to consider the complexities of our perceptions and the fluidity of our understanding of the world around us.
It is certainly possible to dream about dreaming. But the ability to control dreams and intentionally (consciously) move from one dream into another then another, or to move in and out of other people's dreams as portrayed in the film Inception, is pure science fiction fantasy. See attached link for further comments.