2011
DOI: 10.1111/j.1365-2869.2011.00924.x
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Mismatch between subjective alertness and objective performance under sleep restriction is greatest during the biological night

Abstract: SUMMARYSubjective alertness may provide some insight into reduced performance capacity under conditions suboptimal to neurobehavioural functioning, yet the accuracy of this insight remains unclear. We therefore investigated whether subjective alertness reflects the full extent of neurobehavioural impairment during the biological night when sleep is restricted. Twenty-seven young healthy males were assigned to a standard forced desynchrony (FD) protocol (n = 13; 9.33 h in bed ⁄ 28 h day) or a sleeprestricted FD… Show more

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Cited by 92 publications
(67 citation statements)
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“…Nevertheless, these changes were not observed in the objective measurement of performance levels (i.e., PVT). A partial mismatch between subjective and objective assessment of vigilance has been previously reported with sleep curtailment [70][72]. Subjective mood levels have been shown to follow a circadian variation, with lower levels in the early morning and to be reduced with the amount of time awake [73], consistent with our observations.…”
Section: Discussionsupporting
confidence: 91%
“…Nevertheless, these changes were not observed in the objective measurement of performance levels (i.e., PVT). A partial mismatch between subjective and objective assessment of vigilance has been previously reported with sleep curtailment [70][72]. Subjective mood levels have been shown to follow a circadian variation, with lower levels in the early morning and to be reduced with the amount of time awake [73], consistent with our observations.…”
Section: Discussionsupporting
confidence: 91%
“…5 Although the ability to appropriately identify level of alertness has been debated, recent evidence suggests that subjective alertness and performance are modestly correlated, with most discrepancy during the biological night. 10 The association between subjective level of sleepiness and improvement in K-D test times in the current study provides further support for the concept that individuals are fairly effective in rating their level of alertness. However, self-report of sleepiness is a subjective measure not capable of capturing individual vulnerability to sleep deprivation effects.…”
Section: Discussionsupporting
confidence: 63%
“…The individual contribution of sleep inertia, sleep homeostatic and circadian processes to the daily pattern of cognition can be modeled in forced desynchrony protocols that schedule sleep and wakefulness to occur across the circadian cycle. To date, forced desynchrony studies have modeled the independent contribution of sleep homeostatic and circadian processes for vigilance, working memory, sleepiness and mood (Czeisler et al, 1994; Boivin et al, 1997; Wyatt et al, 2004; Lee et al, 2009; Murray et al, 2009; Cohen et al, 2010; Grady et al, 2010; Silva et al, 2010; Zhou et al, 2011a, 2012; Matthews et al, 2012). General findings from these studies indicate that alertness, vigilance, cognitive speed, memory, mood, and driving performance, degrade with time awake and cycle with circadian phase.…”
Section: Neurocognitive and Neuro-affective Functionmentioning
confidence: 99%