Graphic representation of the changes of sleep as humans age

Age-related trends for stage 1 sleep, stage 2 sleep, slow wave sleep, rapid eye movement sleep, wake after sleep onset, and sleep latency (in minutes).

WASO: wake after sleep onset; REM: rapid eye movement; SWS: slow wave sleep.

Republished with permission of Associated Professional Sleep Societies, LLC, from Meta-analysis of quantitative sleep parameters from childhood to old age in healthy individuals: developing normative sleep values across the human lifespan, Ohayon MM, Carskadon MA, Guilleminault C, Vitiello MV, Sleep 2004; 27:1255; permission conveyed through Copyright Clearance Center, Inc.

Graphic 103345 Version 1.0

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