Eli5: When we sleep, spinal fluid washes waste from our brain. What exactly is “waste” in the brain?

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Eli5: When we sleep, spinal fluid washes waste from our brain. What exactly is “waste” in the brain?

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My Spinal fluid is unable to wash “the fluid” from my brain I have a brain condition called Idiopathic Intercranial Hypertension.. this causes this cycle to malfunction and if left untreatead can cause permanent blindness and can also be fatal if medical attention isnt seeked. I have a VP shunt fitted into my head that manually takes the excess brain fluid build up and disposes it to my small (or large, I can’t be quite remember) intestine where it naturally breaks it down safely into my body. It doesn’t really limit my day to day living but I’m not allowed to the North or South poles due the the Earth’s magnetic fields..it will play havoc so bang goes my treks there.

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