Sleep accounts for one-quarter to one-third of the human lifespan, but why do we sleep? This is a question that has baffled scientists for centuries - but no one is really sure.

In this episode, Charlotte explores why we sleep, what happens when we don't sleep, the different sleep stages, and more.

We then take a look at some advice for people who want to know how to sleep better, including how to fix a sleep deficit, the benefits of a good morning and evening routine, and why you shouldn't use screens before bed.

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