Sleep Overview - Concepedia

Principles

Definition

Sleep is the subject of a multidisciplinary academic field dedicated to the investigation of the naturally recurring biological and psychological state characterized by altered consciousness, reduced sensory activity, and inhibition of nearly all voluntary muscles, exploring its regulatory mechanisms, physiological functions, evolutionary significance, and impact on cognitive performance and health.

Ontological type

Neural Mechanisms

Sleep Architecture

Cognitive Functions

Key developments

Key Figures

Neurophysiological Foundations era

Allan Rechtschaffen [1], a pioneering sleep researcher, was affiliated with Stanford University [3] and the University of Chicago [4] in this era. His key contributions include establishing standardized terminology and scoring systems for sleep stages as documented in A manual for standardized terminology, techniques and scoring system for sleep stages in human subjects [6], and reporting on mental activity during sleep [7], which together provided reproducible metrics and cross-study comparability. J. Allan Hobson [2], associated with Harvard University [5] during this era, contributed to early mechanistic models of sleep through brainstem oscillator concepts and the balancing of monoaminergic and cholinergic influences. His papers—Sleep Cycle Oscillation: Reciprocal Discharge by Two Brainstem Neuronal Groups [8], Changes in respiration, heart rate, and systolic blood pressure in human sleep [9], and Cortical unit activity in sleep and waking [10]—helped define brainstem circuits and cortical activity patterns that anchored understanding of sleep stages and REM generation in this era.

Clinical Diagnostic Consolidation era

Charles F. Reynolds [1] is associated with Harvard University [3] and Columbia University [4] in this era. His key contribution is The Pittsburgh Sleep Quality Index [7], a new instrument for psychiatric practice and research that standardized sleep assessment across clinics during the consolidation era. Terry Young [2] is associated with Stanford University [5] and the University of Maryland, Baltimore [6] during this era. Her contributions include population-based insights on sleep-disordered breathing, notably The Occurrence of Sleep-Disordered Breathing among Middle-Aged Adults [8] (1993) and Population-Based Study of Sleep-Disordered Breathing as a Risk Factor for Hypertension [9] (1997), which established prevalence and its linkage to hypertension, informing screening and risk stratification in clinical practice.

Data-driven Sleep Health era

Susan Redline [1] is a pioneering sleep epidemiologist whose work spanned Harvard University [3] and the University of California, San Francisco [4] during the Data-driven Sleep Health era. Her contributions center on refining respiratory event scoring and linking sleep-disordered breathing to mortality and vascular outcomes through key papers such as the 2012 update of the AASM manual [6], the 2009 Sleep-Disordered Breathing and Mortality cohort study [7], and the 2010 Obstructive Sleep Apnea–Hypopnea and Incident Stroke report [8], which helped establish standardized phenotyping and risk pathways crucial for cardiometabolic and neurological health. Daniel J. Gottlieb [2] is linked to Harvard University [3] and the Massachusetts Institute of Technology [5] in this era. His contributions, reflected in the 2012 Rules for Scoring Respiratory Events in Sleep [6], the 2009 Sleep-Disordered Breathing and Mortality cohort study [7], and the 2010 Obstructive Sleep Apnea–Hypopnea and Incident Stroke paper [8], helped translate sleep-disordered breathing research into actionable risk assessment for mortality and stroke prevention, underscoring the translational value of scalable sleep phenotyping in population health.