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Circadian adaptation to night shift work is associated with higher REM sleep duration.
Sleep Health
February 2024
Turner Institute for Brain and Mental Health and School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia. Electronic address:
Objective: To investigate the influence of the degree of circadian adaptation to night work on sleep architecture following night shift.
Methods: Thirty four night workers (11 females; 33.8 ± 10.
The role of circadian phase in sleep and performance during Antarctic winter expeditions.
J Pineal Res
September 2022
Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Boston, Massachusetts, USA.
The Antarctic environment presents an extreme variation in the natural light-dark cycle which can cause variability in the alignment of the circadian pacemaker with the timing of sleep, causing sleep disruption, and impaired mood and performance. This study assessed the incidence of circadian misalignment and the consequences for sleep, cognition, and psychological health in 51 over-wintering Antarctic expeditioners (45.6 ± 11.
View Article and Find Full Text PDFEndogenous circadian regulation and phase resetting of clinical metabolic biomarkers.
J Pineal Res
September 2021
Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Boston, MA, USA.
Shiftwork and circadian disruption are associated with adverse metabolic effects. Therefore, we examined whether clinical biomarkers of metabolic health are under endogenous circadian regulation using a 40 hours constant routine protocol (CR; constant environmental and behavioral conditions) and evaluated the impact of typical daily conditions with periodic sleep and meals (baseline; 8 hours sleep at night, four meals during a 16 hour wake episode) on the phase and amplitude of these rhythms. Additionally, we tested whether these circadian rhythms are reset during simulated shiftwork.
View Article and Find Full Text PDFAssociations between shift work characteristics, shift work schedules, sleep and burnout in North American police officers: a cross-sectional study.
BMJ Open
December 2019
Turner Institute for Brain and Mental Health, School of Psychological Sciences, Monash University, Clayton, Victoria, Australia
Objectives: To examine associations between shift work characteristics and schedules on burnout in police and whether sleep duration and sleepiness were associated with burnout.
Methods: Police officers (n=3140) completed the Maslach Burnout Inventory (emotional exhaustion, depersonalisation, personal accomplishment) and self-reported shift schedules (irregular, rotating, fixed), shift characteristics (night, duration, frequency, work hours), sleep duration and sleepiness.
Results: Irregular schedules, long shifts (≥11 hours), mandatory overtime, short sleep and sleepiness were associated with increased risk of overall burnout in police.
Classifying attentional vulnerability to total sleep deprivation using baseline features of Psychomotor Vigilance Test performance.
Sci Rep
August 2019
Center for Cognitive Neuroscience, Duke-NUS Medical School, Singapore, 169857, Singapore.
There are strong individual differences in performance during sleep deprivation. We assessed whether baseline features of Psychomotor Vigilance Test (PVT) performance can be used for classifying participants' relative attentional vulnerability to total sleep deprivation. In a laboratory, healthy adults (n = 160, aged 18-30 years) completed a 10-min PVT every 2 h while being kept awake for ≥24 hours.
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