How Does Sleep Prevent Alzheimer's and Clear Brain Toxins?

TL;DR

Deep stage-three sleep activates the brain's lymphatic system roughly 90 minutes after falling asleep, letting cerebral spinal fluid wash out amyloid beta and other toxins that build up during the day. Aim for at least 7.5 hours nightly, and keep your sleep timing regular, since consistency now appears more important than any other single sleep factor.

Transcript

What would you like everyone to know about the relationship between sleep and brain function? First of all, sleep is the the best way for you to clear out these amaloid proteins that build up during the day. Wow. When we sleep, we dip into our our deep sleep zone, which is stage three sleep. We're generally when I talk about sleep, I really just ta... Read More

Key Insights

• Sleep is the best way to clear amyloid proteins that build up in the brain during the day, making deep sleep central to long-term brain health and toxin removal.
• Stage three sleep is non-rapid eye movement sleep and the deepest sleep possible, reached generally around 90 minutes after falling asleep, when two major restorative processes occur.
• The lymphatic system activates during deep slow-wave sleep, and cerebral spinal fluid washes debris out of the brain, clearing environmental toxins, mycotoxins, and amyloid beta.
• Glial cells act as immunity cells that shrink in size and sit between neurons during deep sleep, which lets cerebral spinal fluid act like a washing machine flushing the brain.
• Beta amyloid is likely not the root cause of Alzheimer's but a response to inflammation, stress, and modern insults, with accumulation potentially starting as early as age 25 or 30.
• A PNAS study found healthy men sleep-deprived to six hours a night for one week had a 3% epigenetic change, altering roughly 711 of about 20,000 genes for the worse.
• The upregulated genes from sleep deprivation were responsible for tumor production while downregulated genes were immunity genes, linking short sleep to higher cancer risk and weaker immunity.
• Regularity is now emerging as more important than anything else in sleep, and staying within about 80% consistency in bed and wake times protects against negative health outcomes.

Questions & Answers

Q: How does sleep clear toxins and amyloid from the brain?

During deep stage-three slow-wave sleep, roughly 90 minutes after falling asleep, the brain activates the lymphatic system. Cerebral spinal fluid then washes out all the debris that builds up during the day, including environmental toxins, mycotoxins, and amyloid beta. This works because glial cells, which are immunity cells, shrink in size and sit between neurons, allowing the cerebral spinal fluid to act like a washing machine flushing waste from the brain.

Q: What is stage three sleep and why does it matter?

Stage three sleep is non-rapid eye movement sleep and represents the deepest sleep possible, generally reached around 90 minutes after you fall asleep. Two major things happen during this deep sleep zone: the lymphatic system activates so cerebral spinal fluid clears toxins and amyloid beta from the brain, and the body builds up immunity. Louisa Nicola emphasizes stages three and four as the phases that matter most for brain health and toxin clearance.

Q: Is beta amyloid the root cause of Alzheimer's disease?

According to the discussion, beta amyloid protein is seen in the brains of people with Alzheimer's but is not really the root cause of what is going on. Instead, beta amyloid is perhaps a response to inflammation, stress, and modern-day insults like toxic urban living. This accumulation may start as early as age 25 or 30, and one of the best ways to insulate yourself from that potential damage is to focus on getting quality deep sleep.

Q: What did the PNAS sleep deprivation study find?

A well-documented study presented in PNAS took a group of healthy men and subjected them to sleep deprivation of around six hours per night for one week. Over just that seven-day period, they experienced a 3% epigenetic change, altering their genome. With roughly 20,000 genes in the human genome, about 711 genes changed for the worse. Genes that switched on drove tumor production, while immunity genes were downregulated, raising cancer risk and weakening immunity.

Q: How many hours of sleep should you get each night?

Louisa Nicola believes every human should be sleeping a minimum of seven and a half hours per night. After a really tough day physically, mentally, or emotionally, you might need eight and a half or nine hours, since everybody is different. Notably, six hours a night, which some people consider a great night, actually counts as sleep deprivation in the research and can trigger harmful epigenetic changes to how your genes are expressed.

Q: Why is sleep regularity so important?

Research is now finding that regularity is actually more important than anything else in sleep. You should aim to sleep and wake at the same time every day, sticking to that schedule about 80% of the time and staying within roughly 10 to 20% variation. A UK Biobank study showed that around a 10% variation started being associated with negative outcomes and increases in all-cause mortality, likely linked to the same epigenetic changes seen in sleep deprivation.

Q: Are sleep trackers like the Aura ring accurate?

Louisa Nicola wears an Aura ring and sleeps on a temperature-controlled mattress but is clear that trackers are not that accurate, especially their sleep stage reports. As someone trained in sleep science who has run polysomnography studies with many leads measuring numerous signals, she doubts a ring can replicate that. However, trackers are useful for trends, heart rate variability, and tracking time in bed, and can be game-changing for data-driven people who avoid becoming obsessed.

Q: How can high performers who struggle to switch off sleep better?

Nicola asks whether someone has trouble falling asleep or staying asleep. Behaviorally, she recommends writing down everything in your head before bed, journaling the worries keeping you up so the brain can process them. Her high-performing clients set standards rather than goals, such as being offline by 8:30 pm, dimming the lights, and finishing the last meal by 8:30. For supplements, she mentions ashwagandha to downregulate cortisol, turmeric to inhibit the inflammatory NF-kappa B pathway, and GABA, while advising everyone to consult their healthcare provider.

Summary & Key Takeaways

• Sleep, specifically deep stage-three non-REM sleep reached around 90 minutes after falling asleep, activates the lymphatic system so cerebral spinal fluid washes out debris including amyloid beta, environmental toxins, and mycotoxins. Glial immunity cells shrink and sit between neurons, letting the fluid act like a washing machine.

• Beta amyloid seen in Alzheimer's brains is likely a response to inflammation and modern stress rather than the root cause, and accumulation may begin at 25 or 30. A PNAS study showed six hours of sleep for one week caused a 3% epigenetic change, altering about 711 genes for the worse.

• The upregulated genes drove tumor production and the downregulated ones were immunity genes. Nicola recommends at least 7.5 hours nightly, prioritizing regularity within about 80% consistency. For high performers who cannot switch off, she suggests journaling worries, setting standards like being offline by 8:30, and supplements such as ashwagandha, turmeric, and GABA.