While sleepiness assessment metrics were initially developed in medical research, subjective is now widely used both fundamental and applied studies. The Stanford Sleepiness Scale (SSS) the Karolinska (KSS) are often considered gold standard research. However, their convergence specific features have not been sufficiently investigated. present study aims to analyse dynamics of as measured by KS...

Driving Simulators reproduce situations that require tracking and visual searching, the main features of real driving. This study measured the reliability of a monotonous driving scenario to detect the circadian variations of alertness in healthy subjects. Five men and five women underwent a monotonous 30 min driving simulation task every 2 h. Before each driving task subjects completed the Sta...

Workplace sleepiness refers to how sleepy a person feels at work, and it is thought to be associated with negative occupational safety outcomes such as injuries because sleepiness can lead to behavioral decrements at work. This study explored safety behavior as a mediator of the relationship between workplace sleepiness and occupational safety outcomes (e.g., occupational injuries). A survey wa...

BACKGROUND Although sleepiness and fatigue are common symptoms in depressed patients, the relationships among sleepiness, fatigue and treatment of depression have not been fully elucidated. The main objective of this study was to investigate the therapeutic effects of a sedating antidepressant on sleepiness and fatigue in patients with depression. METHODS Forty-two depressed patients, who met...

OBJECTIVE To estimate the association of driver sleepiness with the risk of car crashes. METHODS A population-based case-control study was conducted in Shenyang, a northeastern city in China, between November 2001 and July 2002. The case group comprised 406 car drivers involved in crashes, and 438 car drivers recruited at randomly selected sites, and on the day of week, and the time of day wh...

Night sleepiness in two groups of student volunteers who stayed awake for one night was assessed at standardized time (22:00, 01:00, 04:00, 07:00) by the Stanford Sleepiness Scale (SSS). One group (N=21) chewed the chewing gum from midnight until the end of the experiment in the morning, while the other group (N=43) was not chewing at all. The results show that both groups at the initial assess...

The present study was part of a larger 3-day, 2-night double-blind parallel group design in which 80 young adult men were divided into eight treatment groups to examine the effects of benzodiazepines and caffeine on nocturnal sleep and daytime sleepiness, performance, and mood. The present study was done to examine further the relationship among daytime sleepiness, performance, mood, and noctur...

The proposition that chewing gum can improve alertness was investigated via both physiological and self-rated measures. The Pupillographic Sleepiness Test (PST) provided a measure of pupillary unrest (PUI); a physiological index of daytime sleepiness. Chewing gum reduced the extent of sleepiness as measured by both PUI and self-rated sleepiness. Specifically, in comparison with sham chewing and...

OBJECTIVE The lack of distinction in the clinical use of terms like fatigue and sleepiness is an important issue. While both fatigue and sleepiness can potentially be associated with nonrestorative sleep (NRS) complaints, their relationships are still poorly described. We propose to use Rasch analysis-based methods to study the interrelations of fatigue, sleepiness and NRS. METHODS 150 subjec...

OBJECTIVE To explore whether standardized survey instruments and objective performance measures differentiate traditional constructs of sleepiness and fatigue among a sample of postpartum mothers. Additionally, we wanted to explore the independent associations among these measures with actigraphically measured nocturnal sleep variables. METHOD Seventy-nine postpartum mothers' subjective sleep...