Quick Answer: Dave Asprey's Bulletproof sleep protocol mixes genuinely useful ideas (blue-light blocking, temperature control, sleep tracking) with unproven supplement claims and the dangerous suggestion that you can hack your way to needing less sleep. Most sleep scientists agree that only 1 to 3 percent of people carry the rare short-sleep gene.
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In This Guide
Who Is Dave Asprey and Why Do People Listen to Him?
Dave Asprey is the founder of Bulletproof Coffee, a New York Times best-selling author, and arguably the person most responsible for putting the word "biohacking" into everyday conversation. He built a media empire around the idea that you can optimize every system in your body through technology, nutrition, and sheer willpower.
His credentials are real. He spent years in Silicon Valley, invested millions of dollars into tracking and testing his own biology, and has interviewed hundreds of researchers on his podcast. That earned him a massive following and the unofficial title of "father of biohacking."
But credentials and a large audience do not make every claim true. And when it comes to sleep, Asprey has made some bold ones.
He has claimed to thrive on fewer than six hours of sleep per night. He has promoted specific supplements, devices, and protocols that he says let you sleep less while performing better. He even experimented with polyphasic sleep (breaking sleep into multiple short naps) before abandoning it because, in his own words, it was "for masochists."
So what actually holds up? We went through his main sleep recommendations and checked them against the research.
The Big Claim: You Can Hack Your Way to Needing Less Sleep
What the Research Says About Short Sleep
A genetic mutation in the DEC2 and ADRB1 genes allows some people to function well on six hours or less. But this mutation is exceptionally rare. The ADRB1 variant appears in roughly 4 out of every 100,000 people. While over 20 percent of the population sleeps close to six hours per night, only a small fraction of them carry the gene that makes it safe. The rest are simply sleep-deprived.
This is the centrepiece of Asprey's sleep philosophy, and it is also the most problematic. His argument goes like this: if you optimize sleep quality, you can compress your total sleep time and still perform at a high level.
He defines a good night's sleep as 90 minutes of deep sleep plus 90 minutes of REM. By that math, you could theoretically get all the sleep you need in under five hours.
The problem? Most sleep researchers disagree. Dr. Matthew Walker, neuroscientist and author of Why We Sleep, has been particularly direct: there is no scientific shortcut to needing less sleep. Your body uses different sleep stages for different repair processes, and those stages cycle throughout the night. Cutting hours means cutting cycles.
Our verdict: Mostly unsupported. Unless you carry the rare short-sleep gene (and statistically, you almost certainly do not), trying to hack your way to less sleep is likely doing more harm than good.
Asprey's Sleep Hacks Reviewed One by One
MCT Oil Before Bed
Asprey's claim: Taking a tablespoon of Brain Octane (his branded MCT oil) before bed provides stable energy for your brain overnight and helps you burn fat while you sleep.
The evidence: Research on MCT oil and sleep is thin. The proposed mechanism involves ketone production and blood sugar stabilization, but direct human studies on MCT oil improving sleep quality are virtually nonexistent. One 2023 animal study actually found that MCT-containing diets reduced REM sleep duration, which is the opposite of helpful.
Our verdict: Limited evidence. MCT oil may have other health benefits, but recommending it specifically as a sleep aid is ahead of the science. And yes, Asprey happens to sell it.
Collagen Peptides Before Bed
Asprey's claim: Taking 1 to 2 tablespoons of grass-fed collagen before bed improves sleep quality.
The evidence: This one is more nuanced than you might expect. Collagen is roughly 22 percent glycine by weight, and glycine does have legitimate sleep research behind it. A 15-gram collagen dose delivers about 3.5 grams of glycine, which is the amount shown in studies to improve subjective sleep quality and reduce sleep fragmentation. A 2023 randomized trial found that collagen supplementation reduced nighttime awakenings in physically active men with sleep complaints.
Our verdict: Weak but not baseless. The sleep benefit likely comes from the glycine content, not from collagen itself. You could get the same effect from a standalone glycine supplement for a fraction of the cost. Still, the mechanism is real.
Blue-Light Blocking Glasses
Asprey's claim: Wearing blue-light blocking glasses in the evening preserves melatonin production and helps you fall asleep faster.
The evidence: This is one of Asprey's stronger recommendations. The biological mechanism is well established: blue light suppresses melatonin, delays circadian phase, and prolongs the time it takes to fall asleep. Multiple systematic reviews support the use of blue-light blocking glasses, particularly for people with sleep difficulties, shift workers, and those with delayed sleep phase.
However, a 2025 Cochrane-style review noted that roughly half of randomized trials showed benefits while the other half did not. The glasses appear most helpful for people who already have sleep issues, and less impactful for healthy sleepers.
Our verdict: Supported with caveats. Blue-light management is real science. The glasses work best if you are sensitive to evening light exposure. They are not a magic fix for everyone.
Sleep Tracking with Wearables
Asprey's claim: Using devices like the Oura Ring to monitor your sleep stages lets you optimize for more deep sleep and REM.
The evidence: Sleep tracking can genuinely help you identify patterns. Understanding when you get your best sleep, what disrupts it, and how lifestyle changes affect your numbers is valuable. Asprey's emphasis on tracking deep sleep and REM percentages rather than just total hours is a reasonable approach.
The Orthosomnia Problem
Researchers coined the term "orthosomnia" in 2017 to describe patients who developed anxiety and insomnia from obsessing over their sleep tracker data. About 18 percent of sleep app users reported that tracking made them more worried about their sleep. People with existing insomnia were especially vulnerable. Consumer wearables also have poor accuracy at detecting wake periods and cannot reliably discriminate between sleep stages.
Our verdict: Supported, but use with caution. Track your sleep if it helps you make better decisions. Stop tracking if you find yourself lying awake worrying about your sleep score.
EMF Blocking and Wi-Fi Shutoffs
Asprey's claim: Electromagnetic fields from Wi-Fi routers and electronic devices disrupt sleep. He recommends turning off your router at night and using EMF-blocking devices.
The evidence: This is where Asprey ventures into territory that makes most scientists uncomfortable. A large prospective cohort study found no association between everyday radiofrequency EMF exposure and sleep quality. The researchers also found no evidence that people who reported being "EMF-sensitive" were actually more vulnerable.
Some occupational studies have found associations between high-level EMF exposure (think: high-voltage substations) and poor sleep, but those exposure levels are vastly higher than what your home Wi-Fi router produces. One small 2024 pilot study did find reduced sleep quality during RF-EMF exposure, but the sample size was limited.
Our verdict: Unsupported for typical home exposure. Your Wi-Fi router is not keeping you awake. If you want to improve your sleep environment, focus on darkness, temperature, and noise before worrying about electromagnetic fields.
Temperature Optimization
Asprey's claim: Keeping your bedroom between 60 and 67 degrees Fahrenheit (about 15.5 to 19.5 degrees Celsius) and using cooling technology improves sleep quality.
The evidence: This is solidly backed by science. Core body temperature naturally drops during sleep onset, and a cool bedroom supports that process. The National Sleep Foundation, the American Academy of Sleep Medicine, and virtually every sleep researcher agree that temperature regulation is one of the most important environmental factors for sleep quality.
Our verdict: Supported. This is one of Asprey's best recommendations. A cool bedroom, breathable bedding, and a mattress that does not trap heat all make a measurable difference.
A Note for Ontario Sleepers
Ontario winters make bedroom cooling easy, but our humid summers are a different story. If you find yourself waking up hot in July and August, your mattress materials matter more than any supplement. Gel-infused foams and innerspring hybrids promote better airflow than dense memory foam. At Mattress Miracle in Brantford, we help customers find the right balance of comfort and cooling for every season.
What Asprey Actually Gets Right
It would be unfair to dismiss everything Dave Asprey says about sleep. He deserves credit for several things.
The Genuinely Useful Ideas
- Blue-light awareness: Asprey was one of the earliest mainstream voices pushing people to think about evening light exposure. That message has held up.
- Sleep environment matters: His emphasis on blackout curtains, cool temperatures, and removing electronics from the bedroom is standard sleep hygiene advice that works.
- Quality over quantity framing: While his conclusion (you need less sleep) is wrong, his focus on deep sleep and REM quality has helped people look beyond the simple "eight hours" target.
- Meal timing: His recommendation to stop eating three hours before bed is supported by research on digestion and sleep quality.
- Tracking as a tool: Used responsibly, sleep tracking can reveal patterns you would never notice otherwise.
The issue is not that Asprey is always wrong. The issue is that he mixes good science with supplement sales and wraps it all in the seductive promise that you can outsmart your biology. That makes it hard for regular people to sort fact from marketing.
The Canadian Supplement Angle
If you are reading this from Ontario (or anywhere in Canada), there is an important regulatory difference worth knowing about.
Many of Asprey's recommended supplements are sold through Bulletproof, a US-based company. In the United States, the FDA regulates supplements as a category of food, not drugs. There is no pre-market approval process. Manufacturers do not have to prove their products work before selling them.
Canada is stricter. Health Canada classifies supplements as Natural Health Products (NHPs) and requires pre-market evaluation for safety, efficacy, and quality. Every approved product gets a Natural Product Number (NPN) on the label. If you do not see an NPN, the product has not been reviewed by Health Canada.
This does not mean every US supplement is unsafe. But it does mean Canadian consumers have an extra layer of protection, and it is worth looking for that NPN before spending money on the latest biohacking sleep supplement.
The Honest Take
Dave Asprey is a compelling communicator with a genuine interest in human performance. Some of his sleep advice is backed by solid science. Some of it is backed by the products he sells.
Here is what most sleep scientists would tell you if they sat down at your kitchen table:
You cannot safely reduce your sleep need. You can only make the sleep you get more efficient.
That means a dark, cool room. Consistent bed and wake times. Limiting screens before bed. Managing stress. And, when your mattress is 8 to 10 years old and you are waking up sore, replacing it with something that actually supports your body.
No supplement, device, or protocol can replace the basics. But the basics, done well, can change how you feel every single morning.
Frequently Asked Questions
Does Dave Asprey really sleep less than six hours a night?
Asprey has claimed to function well on fewer than six hours of sleep through optimization. However, the short-sleep gene (DEC2/ADRB1) that allows this safely is found in roughly 1 to 3 percent of the population. Without that genetic variant, sleeping under six hours is associated with increased health risks according to the American Academy of Sleep Medicine.
Is MCT oil before bed actually helpful for sleep?
There are no robust human studies demonstrating that MCT oil improves sleep quality. The proposed mechanism involves blood sugar stabilization and ketone production, but the evidence is mostly theoretical. A 2023 animal study found MCT-containing diets actually reduced REM sleep. If you want a bedtime supplement with better evidence, glycine (3 grams) has stronger research behind it.
Are blue-light blocking glasses worth buying?
They can be, especially if you have trouble falling asleep. The biological mechanism is well established. Multiple reviews support their use for people with sleep difficulties, shift workers, and those exposed to screens in the evening. They are less beneficial for people who already sleep well. Look for glasses that block wavelengths between 400 and 500 nanometres for the best effect.
Should I turn off my Wi-Fi router at night to sleep better?
Probably not necessary. A large prospective study found no association between typical household radiofrequency EMF exposure and sleep quality. Your router emits far less electromagnetic energy than the high-voltage environments where researchers have found effects. Your time is better spent on proven strategies like cooling your bedroom and blocking light.
What is the best way to improve sleep quality without supplements?
Sleep scientists consistently recommend five fundamentals: keep your bedroom cool (15 to 19 degrees Celsius), block all light sources, maintain consistent sleep and wake times, stop eating three hours before bed, and limit screen use in the evening. At Mattress Miracle in Brantford, we also find that a properly supportive mattress makes a bigger difference than most people expect. Call us at (519) 770-0001 if you want help finding the right fit.
Visit Our Brantford Showroom
Mattress Miracle
441 1/2 West Street, Brantford
Phone: (519) 770-0001
Hours: Mon-Wed 10-6, Thu-Fri 10-7, Sat 10-5, Sun 12-4
You do not need to biohack your way to better sleep. Sometimes you just need a mattress that actually fits your body. Come try a few in person. No supplements required, no pressure.
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
- Restonic ComfortCare Dalton & Albany
- Whitney double-sided bamboo mattress
- Somnia 3.0 neck support pillow
Or shop our mattress collection in our Brantford showroom.