Waking is accompanied by a distinct cortisol awakening response.
Strong human evidence
State System · Recovery System
Last reviewed: August 11, 2026
EVIDENCE BY TOPIC
Sleep and circadian rhythm
Wake timing, circadian physiology, sleep, and biological timing across the day.
The entries below are connected by subject, not arranged as a protocol or a complete literature review.
Open an individual claim to see what the evidence supports, what it does not establish, which sources are carrying the interpretation, and where the claim appears in The Human OS Manual.
5 claims
Sleep inertia can temporarily impair alertness and performance after waking.
Strong human evidence
State System · Recovery System
Last reviewed: August 11, 2026
Chronotype reflects meaningful individual differences in circadian timing and sleep–wake preference.
Strong human evidence
Input System · State System · Recovery System
Last reviewed: August 11, 2026
Light is a major regulator of human circadian timing.
Established operating principles
Input System · State System · Recovery System
Last reviewed: August 11, 2026
Sleep supports memory consolidation and the integration of newly acquired information.
Established operating principles
Recovery System · Adaptation System
Last reviewed: August 11, 2026