Testosterone, sleep and the founder's metabolism

Most of the founders, executives and operators I work with came to me for one of three reasons: they're tired all the time, the gut they've been "managing" for a decade is now non-negotiable, or the drive that built their company has quietly gone missing. They blame age. They blame workload. They blame their wives, the weather, the macro environment.

They're almost always wrong. What's actually happening is that three biological systems — testosterone, deep sleep, and metabolic flexibility — have drifted out of spec at the same time, reinforcing each other in a downward loop. Push one back into range and the other two start to recover. Ignore them and no amount of grit compensates.

This is the framework I run with every male client. It is not motivational. It is engineering applied to a control system you happen to live inside.

Lever 1 — Testosterone is not just about sex drive

Testosterone is the master signal for everything a high-performing man actually optimises for: lean mass, recovery from training, motivation, confidence, focus, mood stability, libido, and the ability to fall asleep and stay asleep. When it drops, none of those things hold the line.

Average testosterone levels in Western men have fallen roughly 1% per year since the 1980s. A 35-year-old founder today often has the bloodwork of a 55-year-old from two generations ago. The collapse is not genetic — it's environmental, and it's reversible.

The signs most men dismiss

• You wake up tired even after 7+ hours in bed.
• You used to train hard and recover fast — now everything aches for three days.
• Belly fat has become "structural" and won't move regardless of effort.
• The 3pm slump now starts at 1pm and ends with coffee or sugar.
• Morning erections are rare. Libido feels like a chore-list item.
• You're flatter emotionally — less highs, less drive, more irritability.

These are not signs of getting older. They are signs of a hormone profile that needs the right inputs. Every man over 35 should run a full bloodwork panel — total testosterone, free testosterone, SHBG, estradiol, fasting insulin and HbA1c — at least annually. You cannot optimise a number you refuse to measure.

Lever 2 — Sleep is when testosterone is manufactured

The bulk of a man's daily testosterone production happens during deep and REM sleep, with the biggest pulse just before waking. A landmark 2011 study (Leproult & Van Cauter) put healthy young men on five hours of sleep for one week. Their testosterone dropped by 10–15% — equivalent to ageing them ten to fifteen years in seven nights.

Now stack that on a founder schedule: late dinners, screens until midnight, two glasses of wine to come down, a 5:30am alarm. You are not "doing fine." You are systematically dismantling the hormone that runs you.

What actually destroys founder sleep

1. Alcohol after 7pm. Even one drink suppresses REM and crushes deep sleep, the exact window when testosterone is built.
2. Late, large meals. Digesting at midnight keeps cortisol elevated and core temperature high — both block deep sleep.
3. Inconsistent wake times. The circadian system is calibrated by your wake time, not your bedtime. Drift it by two hours on the weekend and Monday feels like jet lag — because it is.
4. Blue light at night, no light in the morning. Reverse the inputs your ancestors got and you blunt melatonin at night and cortisol in the morning. Both wreck recovery.

Lever 3 — Metabolism: the silent testosterone killer

This is the lever almost no one connects. Visceral fat — the fat around your organs that makes up most of the "founder belly" — is not inert storage. It is a hormonally active organ that produces an enzyme called aromatase. Aromatase converts testosterone into estrogen. The more visceral fat you carry, the more of your own testosterone you convert away every day.

At the same time, insulin resistance (the topic of the insulin article) suppresses SHBG, distorts the testicular signal from the pituitary, and elevates cortisol. Low testosterone and metabolic dysfunction are not two problems. They are the same disease wearing two costumes. Treat one and you almost always move the other.

This is also why testosterone replacement therapy alone — without fixing metabolism and sleep — so often disappoints. You can pour T into a leaky system, but if aromatase is high and sleep is broken, you're heating a house with the windows open.

The protocol I run with every client

In order. Each step amplifies the next. Don't skip ahead — that's how men have been failing at this for twenty years.

1. Fix the sleep window first

• Fixed wake time, seven days a week — even on weekends. Pick the time your weekday demands and hold it.
• 10 minutes of direct sunlight within 30 minutes of waking. Free, non-negotiable.
• No food within 3 hours of sleep. No alcohol within 4.
• Bedroom: 18–19°C, fully dark, phone outside the room.

2. Compress the eating window

A 16:8 eating window (often the 16-hrs For Life rhythm) lowers fasting insulin, drops visceral fat, and reduces aromatase activity within weeks. Less aromatase means more of your own testosterone stays as testosterone. This single change does more for male hormones than any supplement on the market.

3. Lift heavy, three times a week

Compound lifts — squat, deadlift, press, row, pull-up — at challenging weight for 5–8 reps. Forty-five minutes, three times a week. Cardio is fine on top, but resistance training is the testosterone signal. Endless zone-2 alone won't move the needle.

4. Cut alcohol to a hard ceiling

For most of my clients this is the single biggest unlock. A ceiling of 3–4 drinks per week, never two nights in a row, never within 4 hours of sleep. Most men report better sleep, mood, and morning energy within ten days.

5. Measure, don't guess

Baseline bloodwork before you change anything. Re-test at 12 weeks. The numbers I track: total testosterone, free testosterone, SHBG, estradiol, fasting insulin, HbA1c, triglycerides, HDL, hs-CRP, ferritin and vitamin D. No bloodwork = no protocol. We're engineers, not gamblers.

What changes when you get this right

• Total and free testosterone climb measurably within 8–12 weeks — often 20–40% off a low baseline, with no medication.
• Deep sleep increases. You wake before the alarm and feel actually rested.
• Visceral fat drops. The belt notch moves and stays moved.
• Drive comes back — for work, for training, for sex, for the things that originally made you ambitious.
• Recovery from hard training compresses from 72 hours to 24.
• Mood stabilises. The irritability you'd written off as "stress" turns out to have been hormonal.

The bottom line

The men I work with did not get here by being lazy. They got here by optimising every external variable in their lives — calendar, team, capital, product — while ignoring the one internal system that runs all of it. You would never let your company drift this far out of spec without a dashboard. Stop letting your biology.

Sleep, fasting window, training, alcohol, bloodwork. Five inputs. Run them like a protocol, not a wishlist, and your metabolism, hormones and energy come back online in the order they broke down.

That's the work. Not motivation. Not willpower. Biology first, with the discipline of an engineer.