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Chapter 4 · § 4.4 · Recipe

Sleep — Protect Like a Budget

Seven to nine hours, consistent schedule, cool dark room.

By · Updated March 2026 · Last reviewed March 2026 · ~5 min

Problem

Sleep is the one intervention that compounds across every other system. It is also the one most people treat as optional when the week gets hard. Seven to nine hours is the target. How do you actually defend it in a normal life?

Solution

Treat sleep like a budget you cannot go under.

LeverWhat specifically
Consistent scheduleSame bedtime and wake time ±30 minutes, 7 days a week. Weekends count.
Cool, dark roomBedroom 65–68°F. Blackout or a sleep mask. Your body falls asleep on a temperature drop.
Caffeine cutoff2 PM for most adults; earlier if you are a slow metabolizer (check your exome for CYP1A2).
AlcoholWrecks REM. Two or more drinks in the evening is a measurable HRV hit the next morning.
Screens before bedNo bright screens for the last 30 minutes. The content, not just the blue light, is what wakes the brain.
Light in the morning10 minutes outside within the first hour of waking. Anchors the circadian rhythm for the rest of the day.
Consistent bedtime ritualWhatever signals "I am done." Shower, dim lights, reading. Pavlov matters.

Target: 7–9 hours of time in bed with high sleep efficiency. In my cohorts, adherence to the protocol above produced an average +30 to +40 minutes of sleep per night. That alone outperforms most supplements ever marketed for longevity.

✦ Tip Track sleep on a wearable but read the metric the way a gardener reads the weather: in trends, not in one-day spot readings. A single rough night is not an emergency. Two rough weeks in a row is a signal.

Discussion

The hard part is not knowing what to do. It is defending it against everything else on the calendar. The frame I use: if you can't repeat the protocol on the worst day of a bad quarter, it isn't real. A sleep protocol that only works on the weekends is a weekend protocol.

A few things I ruled out: prescription sleep drugs for chronic use (tolerance + architecture problems); melatonin in doses above 0.3–0.5 mg (the doses sold retail are 10–20× higher than anything the research supports, and higher doses can actually worsen sleep architecture); and overreliance on mouth tape / expensive sleep gadgets (sometimes useful, usually substituting for basics above).

△ Warning If your wearable flags regular apneas or your partner reports loud snoring with pauses, get a sleep study. Untreated sleep apnea is a ceiling on every other intervention in this book.

See Also

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