Sleep Architecture & 2-Process Circadian Simulator

Biochemical & Behavioral Levers

Target Bedtime

Target Wake

Caffeine Dose 0 mg

Adenosine A1/A2A receptor antagonism (5.7h half-life)

Caffeine Ingestion Time 14:00 (2:00 PM)

Hours prior to bedtime determines bedtime serum level

Evening Blue-Light Lux 20 Lux (Dim/Book)

ipRGC Melanopsin activation & SCN Melatonin delay

Evening Alcohol Intake 0 Drinks

GABAergic sedation, REM suppression & second-half rebound

Bedroom Temperature 65°F (18.3°C)

Core body temperature drop requirement (-2°F to -3°F)

Circadian Regularity Anchor 100% (Strict)

Consistency of waking anchor over past 7 days

Sleep Efficiency

92%

Optimal (>85%)

Deep NREM (SWS)

115 min

Physical restoration

REM Sleep

108 min

Cognitive & emotional

Sleep Latency

14 min

Normal (10-20m)

Arousals / Fragm.

3 events

Low fragmentation

24-Hour Two-Process Model (Borbély / Walker)

Process S (Adenosine)

Process C (Alerting Signal)

Melatonin Surge

Nighttime 8-Hour Hypnogram (Sleep Stage Architecture)

Awake

REM

NREM 1-2 (Light)

NREM 3 (Slow-Wave Deep)

Mechanistic Sleep Analysis:

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Dr. Matthew Walker's 5 Pillars of Sleep Science

1. Regularity (The Anchor)

Going to bed and waking up at the exact same time every day anchors your circadian pacemaker (suprachiasmatic nucleus), optimizing the timing of Process C alerting waves.

2. Darkness & Melatonin

Evening blue-light lux suppresses pineal melatonin secretion by up to 50% and delays sleep onset by shifting the Process C phase curve forward.

3. Temperature Drop

To initiate sleep, your core body temperature must drop by roughly 2°F to 3°F (1°C). A cool room (~65°F / 18.3°C) facilitates peripheral vasodilation to dump core heat.

4. Caffeine Half-Life

Caffeine competitively antagonizes adenosine receptors. Even when asleep, lingering caffeine blunts Slow-Wave Sleep (NREM 3) delta power by 20–30%.

5. Alcohol Disruption

Alcohol is a sedative, not a sleep aid. Its metabolic aldehydes fragment sleep, create micro-arousals, and severely suppress critical REM dreaming stages.