I Tracked My Deep Sleep and IGF-1 For 6 Months : Here’s the Correlation Nobody Talks About

Everyone talks about getting eight hours of sleep. Nobody talks about what’s happening inside those eight hours.

I wore an Oura ring and got IGF-1 blood draws every eight weeks for six months straight. What I found changed how I think about sleep, aging, and growth hormone permanently.

TL;DR: My deep sleep minutes predicted my IGF-1 levels almost perfectly. Total sleep hours? Barely mattered. Here’s every number from the six months I tracked it.

Why I Started Tracking

Age 36. Feeling like I was aging faster than I should. Slow recovery, soft body composition despite training hard, skin looking dull, injuries taking forever to heal. I’m a software engineer – I spend a lot of time sitting, a lot of time staring at screens, and I’d been telling myself I was “healthy” because I made it to the gym four days a week and slept seven-ish hours.

Then I got bloodwork done on a whim. My doctor ran the standard panel. Everything came back “normal.” Including my IGF-1 at 118 ng/mL – technically within the reference range for a 36-year-old male, but sitting in the bottom 20th percentile for my age group. Functionally, my growth hormone output was closer to what you’d expect in a 55-year-old.

I wasn’t satisfied with “technically fine.” I’d been reading Ron Males’ content at PowerandBulk.com for a couple months at that point – found him through a Reddit thread on natural HGH optimization – and he’d made a point in one of his pieces that stuck with me: reference ranges tell you where the floor is, not where you should be. My 118 ng/mL was above the floor. It wasn’t optimal.

Around the same time I started wearing an Oura ring. Not specifically for the HGH angle – just general curiosity. But when I looked at my first month of sleep data, something clicked immediately.

My total sleep looked decent: 7 hours 12 minutes average. My deep sleep was embarrassing.

The Baseline – Month 0

Here’s every number before I changed anything:

Sleep Metric (Oura, 30-day avg)	My Numbers	Where I Wanted to Be
Total sleep	7h 12m	7-8h
Deep sleep (slow-wave)	38 minutes	90-120 min
REM sleep	1h 22m	90-120 min
Sleep efficiency	81%	85%+
Resting HR	62 bpm	<60 ideal
HRV	34 ms	50+ ideal

Bloodwork Marker	Result	Optimal Target
IGF-1	118 ng/mL	180-250 ng/mL
Fasting glucose	96 mg/dL	<90 mg/dL
Fasting insulin	9.2 µIU/mL	<5 µIU/mL
HbA1c	5.4%	<5.2%

Look at that deep sleep number: 38 minutes. For context, that’s less than half of what most physiology textbooks describe as the minimum for meaningful (slow-wave sleep, also called Stage 3-4 or deep sleep – the stage where the pituitary gland releases the large GH pulses that drive tissue repair, muscle recovery, and IGF-1 production) in an adult.

I was sleeping 7+ hours and my body had almost no opportunity to do what it needed to do during those hours.

Why Deep Sleep Controls Your HGH (Not Total Sleep Hours)

Your sleep has stages. They do very different things. Light sleep (Stages 1-2) is basic maintenance. Your body is asleep but not doing the heavy repair work. Deep slow-wave sleep (Stages 3-4) is where roughly 70-80% of your daily growth hormone is released. Your (pituitary gland fires its largest GH pulses during slow-wave sleep – often 60-70% of your total daily GH output happens in the first deep sleep cycle, within 60-90 minutes of falling asleep). REM is brain recovery, memory consolidation, and the bulk of testosterone production.

So here’s the thing that nobody walks you through: you can sleep eight hours and get almost zero growth hormone benefit if your deep sleep architecture is wrecked. The total hours don’t matter the way we think they do.

I was sleeping 7h 12m. I was getting 38 minutes of deep sleep. My pituitary was barely getting the chance to fire its big pulses. And those GH pulses determine how much IGF-1 the liver produces. (IGF-1 – insulin-like growth factor 1 – is the downstream marker for chronic GH exposure. It reflects what your body has been doing over weeks, not what happened last night. That’s what makes it such a useful tracking marker.)

When I talked through this with Ron, his response was simple: “Your IGF-1 isn’t telling you anything about supplements or protocols yet. It’s telling you your sleep is broken. Fix the sleep first, then we’ll see what’s actually there.”

He was right. I nearly went down the Anabolic Alchemy protocol immediately and started adding things on top of a broken system. Good thing I didn’t.

What I Changed (Month 1-2)

I didn’t take a single new supplement at first. I fixed the obvious deep sleep killers.

1. Last meal 3-4 hours before bed

This was the biggest single change. I was eating dinner at 8:30-9pm, going to bed at 10:30pm. My body was digesting food and running elevated insulin when my first sleep cycle should have been hitting. Elevated blood sugar and insulin directly suppress GH release – if insulin is high when you hit your first deep sleep cycle, that big GH pulse gets blunted or skipped entirely. I moved dinner to 6:30pm consistently.

2. Room temperature to 65°F (18°C)

Was sleeping at around 72°F. Your core body temperature needs to drop for slow-wave sleep to initiate and sustain. A warm room fights the mechanism. Simple fix: cheap fan, thermostat adjustment.

3. Zero alcohol

I was only drinking 2-3 drinks on weekends. I thought that was “moderate” and basically irrelevant. Wrong. Even 2 drinks 4 hours before bed can reduce deep sleep by 20-40%. Your Oura data will confirm this brutally – look at your deep sleep on nights after even a single drink versus completely sober nights. I cut alcohol completely for the six months of this experiment.

4. Magnesium glycinate – 400mg before bed

Magnesium is involved in GABA receptor function, which governs the neurotransmitter activity that facilitates the transition into deep sleep. Most men running modern diets are functionally low in it. Glycine form specifically because it absorbs well and doesn’t cause GI issues at therapeutic doses. Ron had flagged this in the foundation stack framework – I was already supposed to be taking it, and I’d been inconsistent. I got consistent.

5. Consistent sleep/wake time (±30 minutes)

10:15pm bed, 6:15am wake. Every single day including weekends. Your circadian rhythm governs when deep sleep cycles are longest. Irregular sleep times scramble the timing of those cycles. The consistency was boring. The data proved it was the right call.

Month 2 Results

Sleep Metric	Month 0	Month 2	Change
Total sleep	7h 12m	7h 24m	+12 min
Deep sleep	38 min	72 min	+34 min (+89%)
REM sleep	1h 22m	1h 31m	+9 min
Sleep efficiency	81%	87%	+6%
Resting HR	62 bpm	58 bpm	-4 bpm
HRV	34 ms	48 ms	+14 ms

Bloodwork Marker	Month 0	Month 2	Change
IGF-1	118 ng/mL	156 ng/mL	+38 (+32%)
Fasting glucose	96 mg/dL	91 mg/dL	-5
Fasting insulin	9.2 µIU/mL	6.8 µIU/mL	-2.4

Total sleep barely moved: up 12 minutes. Deep sleep nearly doubled. IGF-1 jumped 32%.

Also notice: fasting insulin dropped. Less late-night eating meant lower baseline insulin, which meant less GH suppression during sleep. The variables aren’t independent.

The subjective changes were already real at this point: waking up actually feeling rested for the first time in years, noticeably better gym recovery, and – this sounds weird – a couple people asked if I’d changed my skincare routine. I hadn’t.

Month 2-4: Adding More

6. Post-dinner walk (20 minutes)

Brings blood sugar down faster after the evening meal. My CGM confirmed it directly – lower post-dinner glucose readings correlated with more deep sleep that night. The insulin suppression of GH pulses is dose-dependent. Getting insulin lower faster before sleep matters.

7. Glycine – 3g before bed

Glycine lowers core body temperature and appears to increase time in slow-wave sleep through a mechanism separate from magnesium. Cheap amino acid. I added it alongside the magnesium glycinate. Deep sleep trended up another 10-15 minutes in the weeks after adding it. I can’t isolate the effect perfectly, but the direction was consistent.

8. Morning sunlight – 10-15 minutes within 30 minutes of waking

Not directly about deep sleep. It’s about anchoring the (circadian rhythm – your body’s internal 24-hour clock, regulated primarily by light exposure through the suprachiasmatic nucleus in the hypothalamus) so that melatonin release happens at the right time, which then sets up the correct sleep architecture later. Downstream effect: better-organized sleep cycles with longer slow-wave windows.

9. Caffeine cutoff at noon

Caffeine has a half-life of 5-6 hours. A 2pm coffee still has 50% of its caffeine active at 7-8pm. Caffeine blocks adenosine, which drives sleep pressure. Even if you can “fall asleep fine” with late caffeine, you’re suppressing deep sleep depth and duration. I moved my cutoff to noon. The afternoon I found harder than the alcohol. The data made it worth it.

Month 4 Results

Metric	Month 0	Month 2	Month 4
Total sleep	7h 12m	7h 24m	7h 31m
Deep sleep	38 min	72 min	94 min
REM sleep	1h 22m	1h 31m	1h 38m
Sleep efficiency	81%	87%	91%
Resting HR	62 bpm	58 bpm	56 bpm
HRV	34 ms	48 ms	58 ms
IGF-1	118 ng/mL	156 ng/mL	198 ng/mL
Fasting glucose	96 mg/dL	91 mg/dL	87 mg/dL
Fasting insulin	9.2 µIU/mL	6.8 µIU/mL	5.1 µIU/mL

IGF-1: 118 to 198 ng/mL. A 68% increase in four months. Zero GH secretagogues. Zero peptides.

Deep sleep: 38 to 94 minutes. Total sleep had only increased by 19 minutes total from the start. The magic was entirely in the composition of sleep, not the quantity.

Physical changes at this point were undeniable. Body composition shifting without changing diet or training (visibly leaner, more muscular appearance). Recovery so much better I started hitting PRs again after a plateau that had lasted months. My shoulder issue that had been nagging for a year was fading. My wife commented on my skin twice in the same week – she doesn’t do that.

Month 6 – Final Results

No new interventions in months 4-6. Just consistency with everything already in place.

Metric	Month 0	Month 2	Month 4	Month 6
Total sleep	7h 12m	7h 24m	7h 31m	7h 28m
Deep sleep	38 min	72 min	94 min	102 min
REM sleep	1h 22m	1h 31m	1h 38m	1h 42m
Sleep efficiency	81%	87%	91%	92%
Resting HR	62 bpm	58 bpm	56 bpm	55 bpm
HRV	34 ms	48 ms	58 ms	64 ms
IGF-1	118 ng/mL	156 ng/mL	198 ng/mL	224 ng/mL
Fasting glucose	96 mg/dL	91 mg/dL	87 mg/dL	85 mg/dL
Fasting insulin	9.2 µIU/mL	6.8 µIU/mL	5.1 µIU/mL	4.4 µIU/mL
HbA1c	5.4%	–	–	5.0%

The Final Scoreboard

Metric	Month 0	Month 6	Change
Deep sleep	38 min	102 min	+168%
IGF-1	118 ng/mL	224 ng/mL	+90%
Total sleep	7h 12m	7h 28m	+3.7%
HRV	34 ms	64 ms	+88%
Fasting insulin	9.2 µIU/mL	4.4 µIU/mL	-52%

Total sleep increased 3.7%. Deep sleep increased 168%. IGF-1 increased 90%. Total sleep hours were essentially irrelevant. Sleep architecture was everything.

The Correlation

When I plot my deep sleep minutes against IGF-1 across all four blood draws, the relationship is almost linear:

Deep Sleep (avg min)	IGF-1 (ng/mL)
38	118
72	156
94	198
102	224

Rough math: for every additional 10 minutes of deep sleep, IGF-1 increased by approximately 16-17 ng/mL across my tracking period.

Is this a perfect controlled study? No. I was one person. Other variables were probably changing too. But the trend was consistent across every single measurement over six months, and it lines up with the known mechanism: GH pulses during slow-wave sleep are the primary driver of circulating IGF-1. I wasn’t finding anything surprising. I was just seeing it play out in my own data.

What This Actually Means

If you’re trying to raise IGF-1 naturally, stop thinking about GH secretagogues, arginine, ornithine, or anything marketed as a “GH booster.” Those supplements typically use doses from intravenous studies applied to oral delivery – the mechanism doesn’t translate. Ron walks through this in the supplement framework on PowerandBulk.com, and his position is consistent with what I experienced: fix the sleep architecture before spending money on anything hormonal.

Visceral fat also suppresses GH pulsatility – the more abdominal fat someone carries, the more blunted their overnight GH pulses tend to be. My body composition was improving as the deep sleep improved, partly through better recovery and partly through improved GH-mediated fat metabolism overnight. These things compound on each other.

Start obsessing over how many minutes of deep sleep you’re actually getting and what you’re doing in the 3-4 hours before bed that might be killing it. Your fasting insulin is the number most people overlook – insulin is one of the most powerful suppressors of GH release, and running elevated fasting insulin is a direct tax on your overnight IGF-1 production.

The Protocol Priority List

Tier 1 – Fix These First (free, biggest impact)

• Stop eating 3-4 hours before bed – this one change moved my deep sleep more than anything else
• Consistent sleep and wake time (±30 minutes, including weekends)
• Room temperature 65°F / 18°C
• Cut alcohol completely, or at minimum never within 4 hours of bed
• No caffeine after noon

Tier 2 – Add These Next (cheap, meaningful impact)

• Magnesium glycinate 400mg before bed (roughly $12/month for quality glycinate)
• Glycine 3g before bed (under $10/month)
• Morning sunlight 10-15 minutes within 30 minutes of waking
• Post-dinner walk 15-20 minutes

Tier 3 – Track and Test (worth the investment)

• Oura ring or similar deep sleep tracker – trends over time are reliable even if absolute numbers have some variance
• IGF-1 blood draw at baseline, then every 8-12 weeks
• Fasting insulin – this is the most overlooked marker in this whole conversation, get it tested

Tier 4 – Don’t Bother Until Tiers 1-3 Are Solid

• GH secretagogue supplements including MK-677, sermorelin, or similar
• Arginine or ornithine oral supplementation for GH (the doses required to work weren’t tested orally)
• Anything pharmaceutical or peptide-based – fix the sleep first and see what your actual baseline is

Questions I Know You Have

Is Oura accurate for deep sleep?

Not perfectly against clinical polysomnography. Consumer wearables have variance. But they’re excellent at tracking trends over time. If your Oura shows deep sleep going from 38 to 102 minutes over six months, the absolute numbers might be slightly off but the direction and magnitude of change are reliable. That’s what you’re actually using.

Can I just take MK-677 instead?

MK-677 (ibutamoren) does raise IGF-1. It also consistently raises fasting glucose, increases appetite significantly, can cause water retention, and you’d be pharmacologically forcing a system that’s fundamentally broken by sleep architecture problems. Fix the foundation first. If you fix deep sleep and your IGF-1 is still below 150 ng/mL at 6 months, then the secretagogue conversation makes more sense. Don’t lead with it.

What if I work night shifts?

Genuinely harder. Your biggest GH pulse is tied to your first deep sleep cycle, which is normally anchored to nighttime via circadian rhythm. Shift workers consistently show lower GH output. Best you can do: keep your shifted schedule as consistent as possible, make sleep environment as dark and cool as possible, consider melatonin at 0.5-1mg 30 minutes before your sleep window. But I won’t pretend shift work isn’t a real disadvantage here – it is.

My deep sleep is already 90+ minutes. Why is my IGF-1 still low?

Other factors that suppress IGF-1 even with good deep sleep: high body fat (especially visceral fat suppresses GH pulsatility directly), high fasting insulin or insulin resistance, inadequate protein intake (the liver needs amino acids to produce IGF-1), poor liver health, chronic caloric restriction, and elevated cortisol. Deep sleep is the biggest lever but not the only one. The natural optimization article covers how Ron sequences the interventions when there are multiple variables at play.

Does napping count?

Short naps of 20-30 minutes are mostly light sleep. They won’t contribute meaningful slow-wave sleep or GH pulses. Longer naps of 90 minutes can include a deep sleep cycle but risk disrupting nighttime sleep architecture. For most people: prioritize nighttime deep sleep, don’t rely on naps as a GH optimization strategy.

The Bottom Line

I nearly went down the peptide and secretagogue rabbit hole before I ran this experiment. Glad I didn’t – at least not before understanding what was actually broken.

38 minutes of deep sleep was my bottleneck. Not my age. Not my genetics. Not a supplement deficiency. I was sleeping 7+ hours a night and my pituitary had almost no window to fire the pulses that drive IGF-1 production. I was aging faster than I needed to because of a fixable sleep architecture problem.

Six months. No GH boosters. No peptides. Just fixing deep sleep.

118 to 224 ng/mL.

Your Oura ring is telling you more about your HGH status than most blood tests. You just have to know what to look for.