The alerting effects of caffeine, bright light and face washing after a short daytime nap

Hayashi, Mitsuo; Masuda, Akiko; Hori, Tadao

doi:10.1016/s1388-2457(03)00255-4

Cited by 103 publications

(93 citation statements)

References 49 publications

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“…Some studies have reported that subjective fatigue declined after a short nap 4,12,25,44) , but others, including the present results, have not 9,11,21) . This inconsistency may be caused by differences in defining fatigue.…”

Section: Discussioncontrasting

confidence: 63%

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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: Discussioncontrasting

confidence: 63%

“…As a number of studies suggest [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] , their positive effects on performance and arousal level seem to be evident.…”

Section: Introductionmentioning

confidence: 99%

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

2007

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“…So the effect of sleep inertia might have contributed to the results for subjective sleepiness. If this is the case, the VAS ratings for sleepiness in the later nap conditions could be improved by a strategy for reducing sleep inertia (e.g., caffeine, bright light, and face washing 55) ). Therefore, we recommend a later nocturnal nap as a night shift countermeasure, if techniques combining nocturnal napping and a strategy for minimizing sleep inertia are used.…”

Section: Hypothesis 2: Nap Timing and Early Morning Performancementioning

confidence: 99%

Impact of Nap Length, Nap Timing and Sleep Quality on Sustaining Early Morning Performance

et al. 2007

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The study examined how nap length, nap timing and sleep quality affect early morning performance (6:00 to 8:00). Twelve students participated in a simulated nightshift schedule (22:00 to 8:00) where the length and timing of nocturnal naps were manipulated (0:00-1:00, 0:00-2:00, 4:00-5:00 and 4:00-6:00). A performance test battery was administered consisting of a psychomotor vigilance test, a logical reasoning test, and a visual analogue scale for subjective fatigue and sleepiness. The results showed that a 120-min nap sustained early morning performance better than a 60-min nap. Taking a nap earlier or later did not affect the neurobehavioral performance tests, although participants slept more efficiently during naps later in the night shift. A negative effect of a nocturnal nap during the night shift on subsequent daytime and nocturnal sleep was not observed in the sleep architecture. It still remains unclear whether slow wave sleep plays an important role in sustaining early morning performance. In terms of work safety and sleep health, the results suggest that a longer and later nap is beneficial during night shifts.

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“…On the other hand, the extension of time in bed beyond the usual seven to eight hours a day in healthy subjects resulted in decreased sleepiness measured with the MSLT (29,30). It was also found that naps of relatively short duration, usually less than 30 minutes, improved alertness both after a normal and after a restricted overnight sleep (31,32).…”

Section: Homeostatic and Circadian Components In The Regulation Of Slmentioning

confidence: 98%

Regulation of Sleepiness: The Role of the Arousal System

Bakotić¹,

Radošević-Vidaček²

2012

Archives of Industrial Hygiene and Toxicology

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It is generally accepted that two basic physiological processes regulate sleepiness: homeostatic and circadian rhythmic processes. Recent research has proposed the third component regulating sleepiness, that is, the wake drive or the arousal system. The role of the arousal system in regulating sleepiness has partly been addressed by the studies of the pathophysiology of insomnia, which is often described as a disorder of hyperarousal. Experimental and correlational studies on the relation between sleepiness and arousal in good sleepers have generally indicated that both physiological and cognitive arousal are related to the standard measures of sleepiness. Taking into account the role of the arousal system in regulating sleepiness widens the possibilities for the management of sleep disorders and could also help in solving the problem of excessive sleepiness at work and the wheel. KEY WORDS: circadian rhythms, insomnia, shift work, sleep homeostasis, wake driveBakotić M, and Radošević-Vidaček B. WAKE DRIVE IN SLEEPINESS REGULATION Arh Hig Rada Tokiskol 2012;63 Supplement 1: 23-34 Sleep research and sleep medicine often defi ne sleepiness as a state refl ecting physiological sleep need (1). Other terms used in addition to sleepiness are sleep propensity and sleep tendency. Sleepiness is measured by how long it takes to fall asleep, with tests such as the Multiple Sleep Latency Test (MSLT) (2) and the Maintenance of Wakefulness Test (MWT) (3). Sleepiness is also measured by behaviour such as eye closing, yawning, specifi c head movement (bobbing), facial expressions, and performance in various psychomotor and cognitive tasks (4). In the subjective domain, measurements include various single-or multi-facetted sleepiness rating scales (5, 6) and scales assessing the tendency to fall asleep in various situations (7).Although sleepiness is a normal physiological state related to sleep need, in certain cases it can be a symptom of a serious disease or condition. In such cases the term pathological or excessive sleepiness is used. The American Academy of Sleep Medicine defi nes excessive sleepiness as sleepiness that occurs in situations when a person is expected to be awake and alert (8), which interferes with person's daily functioning such as work or school performance, cognitive functioning, mood, and social interaction.Empirical data indicate that sleepiness signifi cantly contributes to vehicle accidents and that mortality in these accidents is very high, especially in persons younger than 25 years (9-12). Furthermore, sleepiness at the workplace is associated with lower performance and greater risk of occupational accidents and injuries, especially in industrial operations and transportation services (10,(13)(14)(15). Shift workers run the greatest risk of sleepiness at the workplace because their working time often coincides with the time of the day when humans are biologically programmed to sleep. 24On the other hand, shift workers often sleep at the time when circadian factors promote wakefulness, which c...

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The alerting effects of caffeine, bright light and face washing after a short daytime nap

Cited by 103 publications

References 49 publications

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

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

Impact of Nap Length, Nap Timing and Sleep Quality on Sustaining Early Morning Performance

Regulation of Sleepiness: The Role of the Arousal System

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