Why do you dream that someone is dying?

Dreams of death rarely are about actual death, but about transition from one stage of life to the next, or from something familiar to something new. The "someone" usually represents the dreamer.

Our brain is charged with full of thoughts and emotions. The emotionally filled thoughts get manipulated in dream state. Since the body is at rest, the hidden emotions reveal the state of psychological state besides the traces of metabolic disorders. It is the reason for Homeopathy diagnosis based on dreams.

That you are going through some sort of change in your life