00:00Sleep is older than braids, and jellyfish prove it. Scientists found that a species
00:05of upside down jellyfish regularly sleeps in around 8 hour stretches, mostly at night,
00:10and they will even take little midday naps. But here's the wild part, jellyfish don't sleep to
00:16rest their braids, because they don't have one. Instead, sleep helps them repair their DNA.
00:21While they are awake, their nerve cells collect damage, and sleep literally fixes it.
00:26This probably means that sleep is much older than we thought, that it likely predates dinosaurs,
00:31fish, even the development of brains. So, next time you want an app,
00:36just say you are doing what jellyfish do, self-repair.
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