Memory and Learning
One major reason we dream is to help our brains organize and store information. During dreams, our brain processes experiences from the day and decides which memories to keep long-term. This is called memory consolidation. Studies show that people who get good REM sleep perform better on learning tasks and remembering new information.
Emotional Processing
Dreams help us work through emotions and experiences. When you dream, your brain replays situations and processes feelings in a safe environment. This emotional regulation helps us cope with stress, anxiety, and difficult events. The intense brain activity during REM sleep allows us to practice emotional responses without real-world consequences.
Brain Development and Function
Dreaming keeps our brain healthy and active during sleep. REM sleep triggers the release of neurotransmitters that support brain growth and connections between brain cells. Babies and young children spend more time in REM sleep than adults, which supports their developing brains. This suggests dreams play an important role in how our brains develop and function throughout our lives.
What Happens During Dreams
During REM sleep, most of your body is paralyzed, but your brain is almost as active as when you are awake. Your eyes move rapidly side to side, which is why it's called Rapid Eye Movement sleep. Blood flow increases in the brain, and activity increases in areas related to emotions, memories, and sensory experiences. This intense brain activity creates the vivid experiences we call dreams.
Why We Don't Remember Most Dreams
You forget most dreams because the brain chemicals needed for memory storage work differently during REM sleep. When you wake up naturally during or right after a dream, you are more likely to remember it. Dreams fade quickly because your brain doesn't form strong memories of them the same way it does for waking experiences. 
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