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I always hear something like this from my parents, usually after travelling. They say that I should not lie down because I am tired and blood may rush to the brain. While I find this quite plausible, I doubt that there are effects significant enough to cause something bad.

How did this statement originate, and is this true?

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    A quick search reveals that blood flow does indeed change when you lie down - not so sure about it rushing to your brain specifically. But you need to cite a source that makes the claim, something more noteable than "my parents say". Oct 27 at 11:04
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    Could you (as the help center sais), provide a link to the notable claim, a specific quote of it, and why you think it's worth challenging? (It's important to show your research here). Oct 27 at 11:08
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    I'll try to find sources for my claim.
    – soupless
    Oct 27 at 11:14
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    How do you only lie down when you're not tired? I'm so confused... Is the idea that you have to sleep in a recliner or something?
    – Harabeck
    Oct 27 at 16:42
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    You could ask on medicalsciences.stackexchange.com regardless of "notable claim", but there you'd need to show that you've made some effort to find an answer yourself.
    – Fizz
    Oct 27 at 16:47

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