Why do we forget our dreams so quickly?

When we sleep, our brains go through four stages. The initial three are non-rapid eye movement (non-REM) stages.
The first stage includes the transition from wakefulness to sleep, when the body slows down from its daytime rhythm and “twitches” its way into sleep.
The second stage, also of non-REM sleep, involves light sleep. The third stage of sleep is deeper, and it provides the profound kind of rest that one needs to feel refreshed in the morning.
Finally, the time when our brains do most of their dreaming is called the REM sleep stage. But why do we forget our dreams most of the time? And when does erasing the memory of our dreams occur?

Видео Why do we forget our dreams so quickly? канала How Possible