Sleep & Recovery.

Deep sleep, HRV, circadian rhythm, and recovery. Just the science.

A calming, evidence-based guide to understanding your sleep and recovery — what deep sleep actually does, what HRV means and what it doesn’t, how your circadian rhythm works, and when poor sleep might warrant a conversation with a physician. No hacks. No supplements. Just the signals worth paying attention to.

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What’s inside

Six chapters. Sourced and edited.

01Sleep architecture and why deep sleep matters.
02HRV explained without overcomplicating it.
03Circadian rhythm and morning light.
04Caffeine, alcohol, and timing.
05What sleep trackers can and can’t tell you.
06When to talk to a physician about sleep.

An editorial note

“We wrote this for the reader with a dozen tabs open who still can’t tell which sources to trust. Start here.”

— Prologue

We sell longevity protocols. We also write about them.

Prologue’s editorial team wrote this guide. We try to be useful without overpromising. We cite our sources. When the science is strong, we say so. When it is still emerging, we say that too.

Sleep & Recovery.

Six chapters. Sourced and edited.

We sell longevity protocols. We also write about them.

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