Why Sleep Should Be Your Number One Health Priority
If you want to improve your health, your mood, and how well you age, start with the one thing you do every single night: sleep. In this post, I'm covering why sleep matters so much, what's actually happening in your body while you're out, and the habits I've built to make my own sleep as good as it can be.
Quick note on sources: most of the science here comes from Andrew Huberman's book Protocols. Huberman is a Stanford neuroscientist and host of the Huberman Lab podcast, and he does a great job simplifying this stuff. My goal is to make it even easier to digest.
What Happens When You Sleep
Sleep runs in cycles of roughly 90 minutes. Most of us move through three to five of these cycles each night, depending on when we go to bed and when we wake up. Each cycle has four stages.
Stage 1 (N1): Light Sleep
This first stage lasts about five to ten minutes. It's the transition out of wakefulness, and it's where your body starts shifting into repair mode. Your cells rely on ATP (adenosine triphosphate) as their energy source for everything from muscle contraction to cell repair to brain function, and sleep is when your body gets to restore those systems.
Side note: your body uses creatine to help regenerate ATP, which is one reason creatine is one of the most researched supplements out there. If you want to talk about whether it makes sense for you, reach out to me or Coach Carlos.
Stage 2 (N2): Deeper Light Sleep
N2 lasts about 20 minutes. Your core body temperature drops and your heart rate slows. Your brain also starts producing something called sleep spindles, bursts of activity that help consolidate what you learned in the days before. This is a big part of how your brain turns experiences into lasting memories.
Here's the key: you don't just make sleep spindles once in the first cycle and call it good. They show up across every cycle, so the more full cycles you get, the more memory consolidation happens.
Stage 3 (N3): Deep Sleep
Also called slow wave sleep, this is where the heavy repair work happens. Your heart rate slows even further, and your pituitary gland releases growth hormone into your bloodstream. That kicks off active repair of your muscles, brain, tendons, skin, heart, and other tissues broken down during the day.
Deep sleep is also when your brain cleans house. Through what's called glymphatic clearance, fluid flushes through the brain and clears out waste and byproducts. It's one of the most important ways your brain takes care of itself.
Stage 4: REM Sleep
REM (rapid eye movement) is the stage most people have heard of. During REM, your brain strengthens the neural connections you need and prunes the ones you don't.
REM is also where your brain processes emotion. People who are deprived of REM sleep have a harder time unloading the emotional weight of past experiences, including trauma. Over time, a lack of REM can contribute to higher levels of anxiety and depression.
The Cost of Poor Sleep
The long term stakes are real. One study Huberman references found that every 1% reduction in REM sleep was associated with roughly a 9% increase in dementia risk. These numbers are general and there are always outliers, but the point stands: how you sleep today shapes how your brain works 20, 30, and 40 years from now.
Poor sleep is also linked to higher overall mortality risk, and a huge share of Americans aren't getting enough of it.
Huberman's general recommendations:
- Ages 6 to 12: about 9 hours
- Ages 13 to 18: about 8 hours
- Adults: 7 to 9 hours, depending on the individual
This is just my opinion, but when we look at how many people are struggling with anxiety and depression right now, one of the first questions we should be asking is: how's your sleep? Are you on your phone late at night and missing out on the deep sleep and REM your brain needs to process the day? It won't fix everything, but it's a great place to start.
How I've Improved My Sleep
I like to test things on myself before I recommend them to you, so here's what I've been doing.
And yes, I know what some of you are thinking: "Must be nice to go to bed at 9:00, Devan." I get it. I have two three year old girls who want to wrestle at 9:00 at night. But our bedtime is 9:00, and that's when we go to bed. Once you understand that sleep drives your recovery, your cell repair, and your emotional health, it becomes a priority you protect, not something you squeeze in.
I go to bed at 9:00 and usually wake up between 4:30 and 5:00. Here's how I make that happen.
1. I "brick" my phone at night
This is the hardest one for most people, and it's the one that's made the biggest difference for me. My personal weakness is getting stuck on YouTube watching longevity videos, which I realize is a little ironic.
I use an app called Brick. They send you a physical 3D printed brick that you scan to lock or unlock your phone. At 8:05 PM, my phone locks down every app except calls and texts until 6:00 AM. To override it, I'd have to scan the brick, and I've hidden that deep in a filing cabinet. So at 8:00, my phone goes on the counter and I have zero desire to pick it up, because there's nothing to do on it.
Whatever tool you use, find a way to block distracting apps in the evening.
2. I wear blue and green light blocking glasses
In the evening, I wear red tinted lenses that filter out blue and green wavelengths of light. Those wavelengths signal your brain that it's daytime, so cutting them out makes it easier to fall asleep.
3. Bedtime is non negotiable
We're in bed at 9:00. No exceptions.
More Habits That Support Great Sleep
Keep a consistent bedtime. Going to bed within the same 30 minute window every night is huge.
Cut bright light in the hour before bed. Dim the lights in your house, put your phone in red light mode, and avoid blue and green light as bedtime approaches.
Get bright light early. View sunlight, or use a 10,000 lux light (you can find these on Amazon) within 60 minutes of waking. This triggers a healthy early cortisol rise, which helps you feel alert in the morning and lets cortisol fall later in the day so your body is ready for sleep.
Cut caffeine 8 to 10 hours before bed. Throughout the day, a chemical called adenosine builds up in your brain. That's what makes you feel tired. Caffeine doesn't actually give you energy; it blocks adenosine's receptors so your brain can't tell how tired you are. Meanwhile, adenosine keeps building. When the caffeine wears off, all that built up fatigue hits at once. That's the afternoon crash. Caffeine also lingers in your system for hours, so a late cup can quietly wreck your sleep quality even if you fall asleep fine.
I love coffee, so this one was hard, but I don't drink caffeine past noon anymore. I've also cut out energy drinks completely because that much caffeine just isn't necessary. I know we carry them at the gym, and you're welcome to keep drinking them, but it wouldn't hurt my feelings if nobody did.
The Bottom Line
Prioritize your sleep, and every other part of your life will improve. Try these habits for two weeks. I'm confident you'll feel the difference.
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