The simple answer to this question is that nobody knows!!!
Dreams have confused scientists for a long time – and there are lots of different ideas about how and why we dream.
Some scientists think dreams are just our brains randomly firing throughout the night. Others think dreams have a purpose – maybe to help the mind think about what has happened during the day and make sense of it. Some people even think dreams have meanings and are trying to tell us something!
I personally think it is probably just the brain ‘restarting’ and random memories are triggered at the same time, which we see as dreams.
Sorry I couldn’t give you a better answer! I’m sure there is a lot more information on the web if you google it!
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