The Complete Framework for Circadian Biology, Sleep Architecture, and Recovery
17 sections · Updated July 2026 · 24 sources cited
All sections
Why this guide exists — and how to use it
The wake-time reset protocol for a disorganised schedule
Beyond rest — memory, immunity, and metabolic repair
The stages that make up a night, and why the cycle matters
The internal clock, temperature drop, and genetics behind when you feel sleepy
Two systems — sleep pressure and your body clock — that can fall out of sync
The cost that compounds — and the deficit you can't feel
Duration and architecture both change with age — for different reasons
Common sleep disorders — insomnia, apnoea, and circadian disorders
Temperature, darkness, and noise — the physical conditions for sleep
Caffeine, alcohol, exercise, and light — the levers you control
Immune, metabolic, and cognitive effects — sorted by how strong the evidence actually is
CBT-I, melatonin, magnesium, L-theanine, apigenin, and prescription drugs, ranked by evidence
When a nap helps, when it backfires, and what NSDR actually offers
Implementation, self-assessment, and troubleshooting
Key sources behind this guide — linked directly to the source where available
Concise definitions for terms used throughout this guide