Stop Chasing 8 Hours of Sleep
In a Nutshell
Prioritize sleep quality over quantity by optimizing deep sleep for brain maintenance and REM for memory consolidation. Take magnesium L-threonate before bed, sleep on your side, and consider 40 Hz light/sound exposure to enhance glymphatic clearance of brain waste. Use the peptide pinealon to potentially double REM sleep duration.
These notes were generated by AI and may contain inaccuracies.
When it comes to sleep, quality beats quantity. You can actually get more out of 6 hours of sleep than out of 8 hours of sleep if you know how to maximize sleep efficiency. Sleep is foundational for learning and memory. It's also critical for clearing metabolic waste out of your brain, like your brain's daily shower. When sleep is impaired, that metabolic waste can accumulate, contributing over time to cognitive decline and even Alzheimer's disease.
The speaker is part of the 2% of the population at highest genetic risk for Alzheimer's disease. Their PhD was on neurodegenerative diseases and they've seen the devastation firsthand. They are also a terrible sleeper and have always been. This has conspired to make them obsessed with sleep efficiency.
The video will cover practical, science-based, and often overlooked strategies for improving sleep quality. These include a specific supplement, a sleep position, at least one peptide, and even strange lights and sounds. Deep sleep is primarily about physical restoration and brain maintenance. The question is whether sleep position affects glymphatic clearance.
Over the past year, the YouTube channel has grown dramatically, over five-fold, and recently crossed the 1 million mark. The Stay Curious Metabolism Substack has grown even faster and is now a world leader in science. All references and deeper nuances not covered in the video can be found there.
Part one covers why we sleep. Part two discusses the stages of sleep. Parts three and four cover optimizing deep sleep and optimizing REM sleep. Parts three and four are the payoff, but groundwork needs to be laid first.
The truth is there's probably no single answer. There are several theories, and the two most compelling and most important for this discussion are the restoration theory and the neuroplasticity theory. These map well onto the stages of sleep that will be discussed.
The restoration theory is intuitive. Sleep is when the body performs its critical maintenance. If you've worked out hard, muscles grow and repair themselves. Growth hormone actually increases during sleep and the brain clears away metabolic waste.
The neuroplasticity theory proposes that sleep evolved at least in part to support learning and adaptation. During sleep, particularly REM sleep, memories are consolidated. Emotional experiences are processed and neural connections are refined. Sleep is like psychotherapy that doesn't cost $375 an hour.
Sleep appears to serve two broad purposes: repairing and maintaining the body and brain, and strengthening neural circuits that allow us to learn, remember, and adapt neurally.
Looking at sleep through this lens may explain why some animals need less sleep than humans. Giraffes only sleep about 2 to 5 hours per day. Some sharks spend very little time on what we'd recognize as a classic sleep state. Smaller, less complex brains may generate less metabolic waste and require less recovery and upkeep. One of the prices we pay for having large, complex human brains is the need to spend roughly a third of our lives asleep.
A new paper came out after the initial video was recorded that blew the speaker's mind. It was inspired by nature. There are certain examples of animals like dolphins and certain birds that don't sleep like we do. They do unihemispheric sleep. They sleep with one side of the brain at a time with the other side carrying out basically all the functions of a full brain. They can interact with their environment without fully falling asleep.
Stage one is basically falling asleep and is quite brief. Stage two is stable foundational sleep. Stages three and four are deep sleep. Finally, there's REM sleep. The most important and efficient stages of sleep are deep sleep and REM sleep because they map onto the evolutionary functions of sleep discussed earlier.
Deep sleep is primarily about physical restoration and brain maintenance. The brain maintenance piece presents a paradox. Not only are our brains enormous relative to our body size, but they're also incredibly energy-intensive. All that metabolic activity in our brains generates a lot of metabolic waste.
Most organs throughout the body have two major vessel systems. There are the blood vessels, which deliver oxygen and nutrients. And there are the lymphatic vessels which help remove waste. This waste removal system is important because you don't want metabolic debris accumulating in organs and tissues. But the brain does not have a lymphatic system at least not a dominant one. It doesn't have vessels to remove waste because the brain is so jam-packed with neurons, glia, and blood vessels. There was literally no space to pack in the lymphatic system.
The answer is the glymphatic system. It's cleverly named for a combination of the word glia, which means brain support cells, and the lymphatic system that the rest of the body uses. During deep sleep, the brain's energy demands decrease. Because there's less blood flow needed, blood vessels in the brain can constrict, creating little channels around them, like appearing and disappearing water slides. Through these channels, the brain can literally pump cerebral spinal fluid that bathes the brain through these crevices, washing away debris accumulated during the day. It's basically the nightly shower for your brain.
If glymphatic flow is impaired and metabolic waste builds up, this lays the groundwork for cognitive decline. In fact, it's well known that in Alzheimer's disease and dementia, there is impaired glymphatic flow. Your brain isn't being properly cleaned. Deep sleep is when the brain is most metabolically quiet and glymphatic flow can occur.
Researchers were able to show that they can biochemically mimic sleep and particularly deep sleep in mice through a technique known as optogenetics. They caused different regions of the brain to take turns sleeping. At the synaptic level, this mimicked many of the effects of sleep. At the behavioral level, it proved memory consolidation. While the animals didn't actually need to sleep, the question becomes whether in the future we could redesign sleep so we never actually have to sleep.
REM is actually much more metabolically active than deep sleep. In many ways, it resembles wakefulness. Rather than focusing on cleanup and restoration like in deep sleep, REM appears to be critical for memory consolidation, emotional processing, learning, and adaptation.
The first pillar of deep sleep or just sleep in general is maintaining a consistent circadian rhythm and good sleep hygiene. Maintain a consistent sleep schedule, get morning sun exposure, reduce bright light exposure in the evenings.
The supplement discussed is magnesium L-threonate. Magnesium is involved in hundreds of enzymatic reactions throughout the body, including many in the brain, where it plays roles in neurotransmitter regulation, synaptic plasticity, how your neurons wire together, and the activation of what's called the GABA receptor system. This is the system that helps your brain quiet down, calm down, and facilitates deep sleep.
The problem is that most forms of magnesium don't cross the blood-brain barrier very efficiently. That's why magnesium L-threonate exists. It was specifically designed by researchers at MIT to increase magnesium levels in the brain. The L-threonate component helps shuttle magnesium across the blood-brain barrier more efficiently.
There are human data suggesting magnesium L-threonate works, particularly for deep sleep. In one double-blind randomized placebo-controlled trial, participants receiving magnesium L-threonate reported improvements in energy, productivity, and grouchiness. The participants also demonstrated improvements in deep sleep scores measured objectively using a sleep tracker. The authors concluded that magnesium L-threonate improved sleep quality, particularly deep sleep, and even REM sleep to some extent while improving mood, energy, alertness, and daily productivity.
Typically, people take 1 to 2 grams of magnesium L-threonate 30 to 60 minutes before bed.
The speaker doesn't talk about sleep trackers much. They have an Oura ring but don't use it that much because it can stress them out when life happens and they don't get perfect sleep. Having it quantified just in their brain starts a negative vicious loop which is counterproductive to getting better sleep. The thesis behind the video is to control what you can control, and you can't control everything. The pursuit of perfection is endless. Tracking your sleep and doing experiments may help some people, but you don't need to.
In 2015, researchers did an experiment where they took rodents, put them asleep, and put them in an MRI machine, then flipped them around on their side, on their back, face down. They were looking for glymphatic efficiency. The winner was side sleeping. The high-level idea is that gravitational forces and tissue mechanics may collectively create a more favorable environment for glymphatic flow. More efficient brain cleaning occurs in a side sleeping position. While we cannot say for 100% certain that the same effect exists in humans, side sleeping is by far the most common sleeping position in humans.
The brain naturally produces electrical rhythms. One of those rhythms oscillates at about 40 hertz, which is just 40 cycles per second. This is called gamma rhythms. Gamma rhythms are thought to enhance glymphatic flow. Researchers at MIT discovered that exposing mice to light and sound pulsing at 40 hertz enhanced the gamma activity throughout the brain and it did help the brain clean itself. Various animal studies with 40 hertz light and sound treatment caused the hallmarks of Alzheimer's disease like amyloid and tau to decrease, perhaps owing to a combination of improved glymphatic function and changes in immune cell activity in the brain that allowed them to gobble up some of the amyloid and tau. The animals' memories improved on multiple validated memory tests.
The humble answer is we don't know for sure if this works in humans, at least not for prevention of Alzheimer's disease and dementia. Human studies are underway, but true preventative studies would take decades and many millions of dollars. Those studies haven't been done and may never be done. The research that's been done so far was mostly on safety and feasibility, and this is a safe intervention. The idea of entraining the brain to certain rhythms using specific light and sound techniques as a preventative form of medicine against Alzheimer's dementia is extremely promising. Researchers at Harvard, MIT, and elsewhere agree. There are now many commercial devices that exist that can get you this gamma entrainment.
Deep sleep is primarily when the brain maintains itself and cleans up through the glymphatic flow phase. REM sleep is more like the brain's integration phase. This is where memories are consolidated, emotions are processed, and neural circuits are refined. It's also where you have the most vivid dreams.
Beyond the basics like consistent circadian rhythm, light management, and basic sleep hygiene, there's one compound that's receiving a surprising amount of attention for improving REM sleep. It's called pinealon, and there are people reporting it consistently improves their REM sleep, even doubling the REM sleep on sleep trackers.
Pinealon is an extremely small peptide, just three amino acids. It was first developed in Russia from researchers based on peptides isolated originally from the pineal gland, hence its name. The pineal gland is a small structure deep in the center of the brain which is responsible for producing melatonin and helping regulate circadian rhythms. Pinealon's small size allows it to penetrate into your body when taken orally, get into cells and literally latch onto DNA like a tiny koala. Pinealon influences gene expression through DNA modification related to neuroprotection, circadian regulation, and melatonin signaling. At least in animal models, it improves sleep efficiency and improves melatonin signaling.
The speaker has been using pinealon since they first learned about it. The brand they personally use is called Your Protocols. They have a discount code for it. It came recommended by a trusted colleague and meets the quality standards they look for, including third-party testing and manufacturing transparency. While taking pinealon, they've had the most restorative and most memorable sleep they've had in recent years, although not necessarily longer sleep.
The video covered how magnesium L-threonate works with its L-threonate component acting like a VIP pass to get into the brain to calm it down. Side sleeping can improve glymphatic flow and brain cleaning. 40 hertz lights and sound treatment can also enhance glymphatic flow, including products you can access today. Tiny little peptides like pinealon can bind onto your DNA like a micro koala to improve REM sleep. When your head hits the pillow tonight, don't stress. Consider that there's only so much you can control, but what you can control might be more than you think.
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