Why do we need sleep?

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Manage episode 219760801 series 1335729
By Discovered by Player FM and our community — copyright is owned by the publisher, not Player FM, and audio streamed directly from their servers.
Why do we need sleep? How do tides work? Could aliens already be here that we simply can't detect? Plus, how being bird-brained isn't such a bad thing.

436 episodes available. A new episode about every 8 days averaging 21 mins duration .