Sleep
The integrating substrate — and the 24-hour clock that decides when everything else works.
Sleep is the primary regeneration protocol. We track clinical-grade staging (light / REM / deep / wake), the WHOOP multi-dimensional sleep score, and circadian alignment — bedtime consistency is as important as duration. Eight Sleep enables passive, non-wearable tracking; the cortisol awakening response links sleep quality to morning cognitive state. The same-night question: how do the house's hot/cold sequences change deep sleep that very night?
What we track
| Signal | Captures | Target |
|---|---|---|
| Deep / REM | Restorative architecture | >1.5h deep · >1.5h REM |
| Sleep score | Sufficiency, efficiency, consistency | >85 |
| Circadian consistency | Bedtime regularity | within 30 min nightly |
| CAR | Cortisol awakening response | healthy morning rise |
Consistency rivals duration
A regular bed and wake time — within ~30 minutes — is as important as the number of hours. Eight Sleep enables passive, non-wearable tracking; the cortisol awakening response ties sleep quality to the morning cognitive state.
The architecture of a night
| Stage | % of night | Primary function |
|---|---|---|
| Stage 2 — light (foundation) | 45–55% | Memory consolidation; sleep protection |
| Stage 3 — slow-wave (deep) | 13–23% | Physical repair; GH release; glymphatic clearance |
| REM | 20–25% | Procedural & emotional memory consolidation |
The same-night question
Sleep is the integrating substrate — no intervention in the Arete stack can compensate for chronically poor sleep, and excellent sleep amplifies every other one. The house's signature research question: how do the hot/cold room sequences change deep sleep on the very same night they're performed?
The 2017 Nobel Prize was awarded for the molecular mechanism of circadian rhythm. Clock genes (CLOCK/BMAL1 activate PER/CRY, which then suppress them) run a 24-hour feedback loop in every cell. Roughly 40% of the genome is expressed in a circadian pattern.
Master clock vs peripheral clocks
| Clock | Location | Entrained by |
|---|---|---|
| Master clock (SCN) | Suprachiasmatic nucleus, hypothalamus | Light, via the retinohypothalamic tract |
| Peripheral clocks | Every organ — liver, gut, muscle, heart, kidney | Food intake, exercise, temperature |
Internal desynchrony
The defining circadian condition of modern life: the SCN says morning (via light) while peripheral clocks say evening (via late meals, shift work). This internal conflict is a major driver of metabolic disease, mood disorders, cognitive decline and accelerated biological aging — and a primary target for the house's timed protocols.