eli5 why splashing water on your face wakes you up so hard?

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I remember sleeping as a log when i was a kid. They could shout all they want but i would either not wake up or fall back asleep. All it took was one drop of water and id wake up.

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Anonymous 0 Comments

At its core, the brain is designed to notice sensory difference. This is helpful, because usually when your sensory situation (the sum of all your sensory input) changes, it usually means Big Shit. A violent splash of cold water sends your whole body into attention for this reason.

You can test this by plunging your whole body into a cold bath or an icy river! Notice how much more of this effect you get

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