It is said that dreams never come true. That is, one interpretation is that dreams are never complete. A dream wakes up before an event comes to its conclusion.
Not one, but multiple factors are at work behind such incomplete visions. First, we sleep and dream. If you sleep, you will inevitably wake up. As sleep becomes thinner, the more the matter of waking up begins to peek into the recesses of the mind.
On the one hand the dream, on the other hand the tension of reality begins. In this state, the dream gradually begins to fade. That is why dreams are not fully seen.
A second explanation holds that the eyes are responsible for rapid eye movement, or REM. REM is the longest just before waking up. Dreaming is not possible during the REM cycle.
That is, the hazy field where the line between dream and reality is gray. As a result, the last part of the dream gradually leaves the brain. This is why no one can see the end of any dream.