CC BY-NC-ND 4.0 · Sleep Sci 2019; 12(01): 21-27
DOI: 10.5935/1984-0063.20190056
ORIGINAL ARTICLE

Sleep extension reduces fatigue in healthy, normally-sleeping young adults

Janna Mantua
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Lillian Skeiky
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Nora Prindle
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Sara Trach
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Tracy Jill Doty
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Thomas J Balkin
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Allison Joy Brager
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Vincent F. Capaldi*
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
,
Guido Simonelli*
1   Behavioral Biology Branch, Walter Reed Army Institute of Research, Silver Spring, MD, USA.
› Author Affiliations

Objective To assess the effects of one week of sleep extension on mood, fatigue and subjective sleepiness in normal-sleeping young adults.

Methods Twenty-seven adults (age 24.4±5.4 years, 11 female) participated. At-home baseline sleep/wake patterns were recorded with wrist actigraphy for 14 days. This was followed by two nights of in-lab baseline sleep with 8 hours time in bed (TIB), then 7 nights with TIB extended to 10 hours (2100-0700 hours). Fatigue, mood, and sleepiness were assessed following the 2nd and 9th nights of in-laboratory sleep (i.e., 2 nights with 8hTIB and 7 nights with 10 hours TIB, respectively) using the Automated Neuropsychological Assessment Metric and Karolinska Sleepiness Scale. Paired t-tests were used to compare mood, fatigue, and sleepiness ratings between conditions.

Results At-home wrist actigraphy revealed a mean nightly total sleep time (TST) of 7.53 +/- 0.88 hours of sleep per night. Mean in-lab baseline sleep duration (7.76 +/- 0.59) did not differ from at-home sleep. However, during sleep extension, mean TST was 9.36 +/- 0.37 hours per night, significantly more than during the in-lab baseline (p < .001). Following sleep extension, fatigue ratings were significantly reduced, relative to baseline (p = .03). However, sleep extension had no other significant effects on subjective ratings of mood or sleepiness.

Conclusions Sleep extension resulted in reduced fatigue in healthy, normal-sleeping young adults, although subjective sleepiness and mood were not improved. Implications include the possibility that (a) the effects of sleep extension on various aspects of mood depend upon the extent to which those aspects of mood are made salient by the study design and methodology; and (b) sleep extension may prove beneficial to fatigue-related conditions such as “burnout.”

* Co-Senior authors.




Publication History

Received: 11 September 2018

Accepted: 18 January 2019

Article published online:
31 October 2023

© 2023. 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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