Why do we dream and what is their evolutionary purpose?

Dreams are like stories your brain tells you while you're sleeping to help you learn and stay safe.

When you sleep, your brain is busy working on all the things you experienced during the day. Sometimes, it plays them back in a fun way, that’s dreaming. Imagine you’re playing with blocks all day, and when you go to bed, your brain shows you a movie of you building a tall tower, that is a dream!

Your brain uses dreams to practice for the future. If you had a scary moment during the day, like being chased by a dog, your brain might show you that chase again in a dream. This helps you get better at running away from dogs (or other things) when it happens for real.

Long ago, people didn’t have phones or TVs to help them relax. So their brains used dreams as training. If they dreamed about hunting or hiding from a lion, it helped them get better at those skills in the morning, just like you practice math problems so you can do better on a test.

Dreams are your brain’s way of playing and learning while you sleep!