The effects of a 20-min nap at noon on sleepiness, performance and EEG activity

Hayashi, Mitsuo; Ito, Sukenobu; Hori, Tadao

doi:10.1016/s0167-8760(99)00009-4

Cited by 84 publications

(77 citation statements)

References 11 publications

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“…As reported earlier 8,9,25,[48][49][50] , a 20-min nap is long enough to obtain recuperative effects and short enough to avoid sleep inertia. Moreover, subjective mood and sleepiness after the bright light exposure deteriorated significantly more than after the short nap in Session 4.…”

Section: Discussionsupporting

confidence: 53%

A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

2007

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While the effects of a short nap on performance and arousal level have been well investigated, less attention has been paid to its effects on mood status. The aim of the present study was to examine the effects of a short nap and natural bright light exposure on mood status. Participants were 16 healthy females who were on average 38.1 (SD = 2.68) yr old. From 11:00 to 12:00, the participants carried out a set of tasks twice with baseline lighting (<100 lux). From 12:40 to 13:10, they were subjected to three experimental conditions: control (<100 lux), natural bright light (>2,000 lux), and a 20-min nap. From 13:10 to 16:10, the tasks were repeated six times with the baseline lighting. To measure mood status, multiple visual analogue scales (to measure anxiety, sadness, anger, confusion, apathy, fatigue, and sleepiness) and the Mood Check List 3 (MCL-3) (to derive "pleasantness", "satisfaction" and "relaxation") were employed. The results showed that brief (30 min) natural bright light exposure improved one dimension of mood status, "pleasantness". A short nap also improved dimensions of mood status ("pleasantness", "satisfaction", and "relaxation"). These results suggest that the proper application of both natural light and a short nap shifts the mood status to the positive/favorable side.

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Section: Discussionsupporting

confidence: 53%

A Short Nap and Natural Bright Light Exposure Improve Positive Mood Status

2007

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“…However, as for short-term memory and arithmetic calculation, these tasks' mental workload are relatively overload, the subjects who didn't take LTN weren't easily to stimulate sleepiness, and the result is that their performance are the same as those who took LTN. Hayashi et al have also gotten such conclusion [7]. This research results indicated that the effect of LTN on habitual nappers' mental work performance is moderated by the nature of mental work at 16:30-17:30 and 20:00-21:00.…”

Section: Discussionsupporting

confidence: 52%

“…In specification, the experimental task of vigilance reaction is relatively bald, such tasks may easily induce the subjects who didn't take LTN to desire sleep, and the result is that their performance is worse than the subjects who took LTN. Hayashi et al also took for that nap could reduce human sleepiness and enhance vigilance [7,8,12]. However, as for short-term memory and arithmetic calculation, these tasks' mental workload are relatively overload, the subjects who didn't take LTN weren't easily to stimulate sleepiness, and the result is that their performance are the same as those who took LTN.…”

Section: Discussionmentioning

confidence: 99%

“…Hayashi et al hold that sleep inertia is inevitable [7], and Taub [13], Dinges et al believed that sleep inertia may last 15-35 minutes [14]. In this study, the measurement of mental work performance is carried out 30 minutes after LTN, as for the subjects who took LTN, their mental work performance has not changed significantly, which provides indirect evidence for that sleep inertia may last 15-35 minutes, because if sleep inertial exceeds 30 minutes, the mental work performance of the subjects who took LTN at 14:30-15:30 should be lower than that at 16:30-17:30 and 20:00-21:00, but this experiment result wasn't the case.…”

Section: Discussionmentioning

confidence: 99%

“…Milner, Fogel and Cote studied the effects of afternoon nap on motor performance and the moderation effects of habitual napping between them [6]. Hayashi et al studied the effects of both afternoon nap and lunch time nap on mood, performance and EEG activity [7][8]. Driskell and Mullen made A Meta-Analysis about the efficacy of naps as a fatigue countermeasure [9].…”

Section: Introductionmentioning

confidence: 99%

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