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CC BY-NC-ND 4.0 · Sleep Sci 2024; 17(03): e255-e262
DOI: 10.1055/s-0044-1780500
Original Article

Sleep, Sleepiness, and Memory

Bianca Estefani Schmidt 
Federal University of Fronteira Sul, Passo Fundo, RS, Brazil
,
Lucas Henrique Lopes-de-Souza
Federal University of Fronteira Sul, Passo Fundo, RS, Brazil
,
Athany Gutierres
Federal University of Fronteira Sul, Passo Fundo, RS, Brazil
,
Tiago Teixeira Simon
Federal University of Fronteira Sul, Passo Fundo, RS, Brazil
› Author Affiliations Funding Source This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.
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Abstract

Objective To evaluate the relationship between sleep and sleepiness with memory complaints.

Materials and Methods Patients who were submitted to polysomnography between May and September of 2022 and answered the prospective and retrospective memory questionnaire and the Epworth sleepiness scale were included, respectively. Data were entered into an Excel spreadsheet and converted to a file compatible with the SPSS software.

Results The sample consisted of 98 subjects, 62.2% male, mean age of 45.9 years, 73.4% overweight, 54.1% with comorbidities, and 51% with excessive sleepiness. There was a significant difference in sleep efficiency, respiratory disturbance index (RDI), slow wave sleep (SWS), and rapid eye movement (REM) sleep for the group with comorbidities; in latency to sleep and SWS between genders; and in RDI for the body mass index group. No correlation between RDI and memory could be identified, but there were statistically significant correlations between REM and sleep efficiency; RDI and REM sleep; RDI and SWS; SWS and sleep efficiency; and sleep efficiency and latency to sleep onset. Older adults performed better on memory tests when total sleep time (TST) is longer than 5 hours and excessive daytime sleepiness is related to complaints of prospective, retrospective, and total memory.

Conclusion Elderly people with TST longer than 5 hours have a better memory. Although a correlation between RDI and memory was not observed, a correlation between excessive daytime sleepiness—one of the main symptoms of patients with sleep disorders—and memory was.

Keywords

memory - polysomnography - sleepiness


Publication History

Received: 20 February 2023

Accepted: 27 September 2023

Article published online:
13 May 2024

© 2024. Brazilian Sleep Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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