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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Sleep Med. 2020 May 30;77:209–225. doi: 10.1016/j.sleep.2020.05.029

Figure 2. Sleep Differences in Elderly versus Young Individuals.

Figure 2.

Polysomnographic (PSG) data showing sleep architecture in a young healthy adult (panel A) and an older healthy adult (panel B). The elderly show a more fragmented and less integrated sleep, shifting from deeper to lighter sleep stages multiple times during nighttime. Schematic illustration comprehensive of all sleep differences found in healthy elderly compared to young individuals (panel C). Non-rapid eye movement sleep (NREM), rapid eye movement sleep (REM), slow-wave sleep (SWS), slow waves (SW), slow-wave activity (SWA), sleep spindles (SS), K-complexes (K-c).