A5052053001- Sleep and Work-Related Fatigue
- Sleep and related disorders
- Impact of Light on Environment and Health
- Circadian rhythm and melatonin
- Sleep and Wakefulness Research
- Ergonomics and Musculoskeletal Disorders
- Vestibular and auditory disorders
- Human-Automation Interaction and Safety
- Non-Invasive Vital Sign Monitoring
- Older Adults Driving Studies
- Occupational Health and Performance
- Heart Rate Variability and Autonomic Control
- Building Energy and Comfort Optimization
- Urban Transport and Accessibility
Adelaide Institute for Sleep Health
2022-2025
Flinders University
2022-2025
Irregularities in sleep duration and timing have emerged as potential risk factors for hypertension. This study examined associations between irregularity with hypertension a large, global sample over multiple months.Data from 12 287 adults, who used an under-mattress device to monitor also provided blood pressure recordings on ≥5 separate occasions, were analyzed. Sleep was assessed the SD total time across ≈9-month recording period. SDs onset time, midpoint, offset time. Logistic...
Abstract Study Objective Night work has detrimental impacts on sleep and performance, primarily due to misalignment between sleep–wake schedules underlying circadian rhythms. This study tested whether circadian-informed lighting accelerated phase delay, thus adjustment night work, compared blue-depleted standard under simulated submariner conditions. Methods Nineteen healthy sleepers (12 males; mean ± SD aged 29 10 years) participated in two separate 8-day visits approximately 1 month apart...
Summary Predicting vigilance impairment in high‐risk shift work occupations is critical to help reduce workplace errors and accidents. Current methods rely on multi‐night, often manually entered, sleep data. This study developed a machine learning model for predicting based single prior period, derived from an under‐mattress sensor. Twenty‐four healthy volunteers (mean [SD] age = 27.6 [9.5] years, 12 male) attended the laboratory two separate occasions, 1 month apart, compare wake...
Summary Sleepiness‐related errors are a leading cause of driving accidents, requiring drivers to effectively monitor sleepiness levels. However, there inter‐individual differences in performance after sleep loss, with some showing poor while others show minimal impairment. This research explored if self‐reported and healthy who exhibited vulnerability or resistance objective impairment following extended wakefulness. Thirty‐two adults (female = 18, mean age 33.0 ± 14.6 years) completed five...
Abstract Introduction Extended wakefulness of up to 24 hours has been associated with severe impairments in performance and attention measures. The impairment may not be due solely sleep loss since some recovery function occurs the next day even continued loss. A circadian effect is likely a significant contributor measures apparent many studies. Despite this recognition, few studies have directly compared contributions accumulated rhythm on cognitive performance. Methods We analyzed data...
Abstract Study Objectives Shiftwork is associated with cognitive impairment and reduced sleep time quality, largely due to circadian misalignment. This study tested if circadian-informed lighting could improve performance during simulated night shifts versus dim control lighting. Methods Nineteen healthy participants (mean ± SD 29 10 years, 12 males, 7 females) were recruited a laboratory consisting of two counterbalanced 8-day conditions (order randomized) 1-month apart: (1) condition -...
Abstract Introduction We previously found that a circadian-informed lighting intervention accelerated circadian retiming, improved cognitive performance and sleep during 4-days of simulated nightwork. This study explores the independent combined effects retiming duration on improvements with lighting. Methods Data were from 19 healthy sleepers (12 male; mean±SD aged 29 ±10 y) underwent two 8-day in-lab protocols control On days 3-7, participants transitioned to day sleeps (10:00–19:00) tests...
Abstract ORP is a continuous metric of sleep depth and wake propensity, which distinguishes different levels within the same conventional stage. Circadian-informed lighting may improve compared to regular, dim lighting. Previous analyses found that circadian-informed extended N2 standard The present study used further elucidate effects under during shift work. Nineteen healthy sleepers (12 males, mean±SD 29±10yrs) underwent two 8-day sessions (circadian-informed versus lighting). During days...
Abstract Introduction Sleep is vitally important to maintain cognitive function. trackers can reliably estimate several sleep metrics help predict performance, but associations between sleep-tracker estimated and domains are unclear. This study examined tracker-estimated next-day performance across domains, including vigilant attention, working memory, risky decision-making. Methods Twenty four participants (mean[SD] age=28[9] years, 12/12 male/female) attended the laboratory twice for 8-day...
Abstract Introduction Driver fatigue is a significant contributor to road crashes, but identifying individuals at driving risk challenging. We examined the potential of simple baseline vestibular ocular motor system (VOMS) assessment via virtual reality goggles predict subsequent vulnerability simulator impairment following extended wakefulness. Methods 49 (Mean±SD Age 32.6±12.9, 45% Males) underwent 9hr sleep opportunity followed by approximately ~29hrs wakefulness with five 60min...
Abstract Introduction Driver fatigue contributes to 2-16% of road crashes, highlighting the need for improved detection at-risk drivers. We used a novel and brief test vestibular ocular motor system (VOMS) assessed via virtual reality goggles predict alertness state driving simulator performance during 29hr extended wakefulness. Methods 49 individuals (Mean±SD Age, 32.6±12.9, 45% Males) undergone 9hr baseline sleep opportunity followed by ~29hrs wakefulness with five 60min assessments....
Abstract Sleep-wake state discrepancy is a common phenomenon for individuals with insomnia, where an individual self-reports worse sleep parameter values than observed in polysomnography-derived values. However, this presumes there no systematic bias versus self-report estimates healthy individuals, which may not be true. This study aimed to test potential sleep-wake group of (N=49, aged 33.9±14.1 years) who underwent in-laboratory polysomnography (PSG) and completed concurrent self-reported...
Abstract Introduction Due to misalignment between circadian timing and the work/rest schedule, cognitive performance during night shift-work is often poor. This study tested a circadian-informed lighting strategy designed improve on-shift through alerting effects, faster adjustment schedule promoting more sleep off-shift, compared standard lighting. Methods A randomised controlled, within-subjects, counter-balanced cross-over was performed examine versus on simulated 8-day schedule. Nineteen...
Abstract Introduction Night shift-work results in misalignment between circadian timing and the sleep/wake schedule, negatively impacting sleep performance. In encapsulated environments (e.g., submarines), lack of strong daily solar lighting cues may impair entrainment to night schedule. This study designed tested a circadian-informed strategy promote faster phase delays adjust compared standard lighting. Methods Nineteen healthy sleepers (12 males/7 females, mean±SD aged 28.7±10.4 years)...
Abstract Introduction Subjective sleepiness and driving performance are generally associated but show inter-individual variability. Specifically, some people more vulnerable, while others resistant to impairment during extended wakefulness. We examined the relationship between subjective in groups versus vulnerable Methods Thirty-two adults (female=18, mean age=33.0yrs, SD=14.6) completed five 60-minute simulator assessments across 29 hours of Perceived (Karolinska scale, KSS) (nine-point...
Abstract Introduction The timing of circadian and sleep-wake behaviours is disrupted by night shift-work. Interventions involving light may prove beneficial in adjusting the rhythm to shift work, although changes vigilance remain uncertain. This study examined temporal relationship between core body temperature (CBT) during a work-shift through lighting. Methods 19 healthy individuals (12 males, mean±SD age 28.7±10.4 years) participated two 8-day experimental conditions with 4 days...
Abstract Introduction Consumer sleep trackers are useful for tracking daily sleep, particularly in shift-workers, yet large, multi-night validations against direct measures lacking. Conducted as one of the largest tracker validation studies to date, this study evaluated performance an under-mattress sensor (Withings Sleep Analyzer [WSA]) classify and wake versus polysomnography (PSG) a laboratory protocol with both day night opportunities. Methods 27 healthy sleepers attended twice, 8...
Abstract Introduction Performance impairments are risky in many industries, including healthcare and defence. Predicting when more likely to occur is critical reduce costly workplace accidents errors. This study created models for predicting vigilance during simulated night shift-work from under-mattress sleep sensor data. Methods The parent compared two conditions phase delaying individuals adjust shift-work. Participants (N=11) attended the laboratory eight days per condition, one month...
Abstract Introduction Shift-work results in misalignment between circadian timing and the sleep/wake schedule, negatively impacting sleep performance. In encapsulated environments (e.g., submarines), lack of strong daily lighting cues impairs entrainment. This study tested whether circadian-informed LED promotes greater phase delays to adjust night shift-work compared standard lighting. Method To date, 11 healthy sleepers (7 males, mean±SD age27.6±8.5 y, N=24 anticipated) have completed two...