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DoctorWaluigiTime t1_j6ctbkp wrote

Reply to comment by ThePhysicsOfBaseball in ELI5: why do our bodies randomly act like we haven’t had water in days and that we need to chug a bunch randomly? by Serratedlily

Indeed. If thirst meant dehydration, then everyone sleeping for 6+ hours a night would be dehydrated every morning lol.

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RockinMadRiot t1_j6d1n90 wrote

But you could argue that we aren't doing as much in our sleep so using less fluid, when awake that's a different matter as we are using everything, including our brains.

Edit: just re-read, yes I agree with you. Thirst is just a sign you are starting to get low and need water, if you ignore that then very likely you will have dehydration

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