► Why do we dream? Vishnu, aged nine, Kerala

That’s a really interesting question, and people have been asking it for thousands of years. But it’s difficult to answer because dreams are difficult to study scientifically.

Think about it: how easy do you find it to remember your dreams every night? Not everyone can do this. If we can’t remember our dreams, we can’t study them.

Some ancient cultures like the Egyptians, the Greeks and the Romans believed that dreams were important messages from the gods. But even they could not agree about exactly where dreams come from, why they happen or what they might mean.

In the last 100 years, many scientists across the world have learned a lot about the science of dreaming. But even still, there is disagreement.

Some scientists think dreams hav

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