Madeline Sprajcer

• Doctor of Philosophy
• Central Queensland University

Adequate sleep is essential to support daily functioning, health, and wellbeing. A 2019 Australian Parliamentary Inquiry made 11 key recommendations, setting a national agenda to grow sleep research and clinical sleep medicine to improve the sleep health of Australians. In 2023, the Australian Federal Government endorsed many of these recommendatio...

Objectives: This study assessed the feasibility of Sleepfit, an app-based sleep intervention for shiftworkers, to evaluate participant reach, engagement, and interaction. Methods: The RE-AIM framework guided the feasibility assessment. Participants from various shiftwork industries (e.g. healthcare, mining) completed a 14-day trial of the Sleepf...

Increased fatigue risk has been associated with safety‐critical events such as work‐related injuries. While control measures are needed to reduce these risks, the wide range and complexities of fatigue risk management strategies can make it difficult for organizations to prioritize efforts given limited resources and time. Given these challenges, t...

This study explored measures of subjective and objective sleep health and the association with fall occurrence and falls risk for older adults. A longitudinal observational study was conducted with participants in residential aged care (n = 36) and community dwelling (n = 35) settings. At baseline, objective sleep data involved wearing wrist worn a...

Young adults are increasingly joining shiftwork professions, exposing them to elevated health risks. To mitigate these risks, tailored, evidence-based resources on health areas most affected by shiftwork - sleep, nutrition, and physical activity – are essential. To ensure such resources are tailored and engaging, lived experience must be embedded i...

Shiftwork – employment outside traditional waking hours – impacts sleep, contributing to circadian disruption and increased risk for numerous poor health outcomes. Young adults are increasingly engaging in shiftwork, therefore requiring tailored, evidence-based sleep resources early in their careers to mitigate sleep and health risks. Despite this...

Introduction The increasing prevalence of shiftwork among young adults poses significant health risks, primarily due to its disruptive effects on sleep, nutrition and physical activity. Addressing these risks necessitates the development of tailored, evidence‐based resources to support these key health behaviours. Participatory research approaches,...

Introduction It is well established that worker fatigue is associated with an increased risk of accident, injury and poor work performance [1]. Shift workers typically experience greater fatigue than day workers, due to factors including circadian disruption, long shifts, rotating rosters and limited sleep opportunities. The healthcare industry rel...

Background Chronic disease is the leading cause of death globally. Sleep, diet, and physical activity are modifiable health behaviours that are key for reducing the burden of chronic disease. These health behaviours are collectively termed ‘The 3 Pillars of Health’ and are critical for populations who are at risk of poor health. Shiftworkers are on...

Objective: Insufficient sleep, and particularly difficulties initiating sleep, are prevalent in the community. Treatment for poor sleep typically consists of pharmacological intervention, or cognitive behavioural therapies - which can be both costly and time-consuming. Evidence suggests that sexual activities may positively impact sleep. However, l...

Infant sleep problems have been associated with a myriad of adverse child and parent outcomes, yet whether these problems may pose a risk for parents on the road has received little research attention. This study sought to test whether mothers of infants with insomnia are at an elevated risk for vehicular crashes, by comparing their objectively mea...

Introduction Carers who provide support for those living with a disability or long-term health conditions have been recognised as being at increased risk of negative health outcomes due to the demands of caregiving. In particular, carers are much more likely than their non-carer counterparts to experience poor sleep outcomes such as lower sleep qua...

Introduction Fatigue detection technology (FDT) is commonly used in the Australian road transport industry to monitor and/or detect driver fatigue. These devices typically provide alerts to drivers and their organisation if fatigue is detected and aim to reduce incidences of fatigue-related vehicle crashes and/or improve driver behaviour. The rise...

Introduction New mothers typically experience a high level of sleep disruption during the first year of their child’s life. Other populations who are likely to experience sleep disruption (e.g., shift workers) are considered at-risk for fatigued driving. As a result, significant educational resources and support are available to minimise risks for...

Background Increasing engagement with sleep, diet, and physical activity (PA) is critical for populations who are at higher risk of poor health, such as shiftworkers. To increase engagement in sleep, diet and PA, it is critical to first understand which of these behaviours Australians currently prioritise and whether this prioritisation relates to...

Introduction Addressing the urgent public health concern of sleep health among shiftworkers, our study examined the application and effectiveness of a tailored sleep intervention, the Sleepfit app. We assessed reach, effectiveness, adoption, and maintenance, while identifying potential implementation barriers across diverse shiftwork industries. M...

New mothers generally experience poor and/or disrupted sleep. A range of infant care and mental health factors may impact new mothers' sleep quality. A cross-sectional online survey was completed by a sample of 101 Australian new mothers with children under 12 months (M = 5.52 months, SD = 3.29 months) to examine the relationship between infant fee...

Driver fatigue is a contributory factor in approximately 20% of vehicle crashes. While other causal factors (eg, drink-driving) have decreased in recent decades due to increased public education strategies and punitive measures, similar decreases have not been seen in fatigue-related crashes. Fatigued driving could be managed in a similar way to dr...

Regulatory guidance materials for fatigue management typically advise that employees be provided with days or weeks of advance notice of schedules/rosters. However, the scientific evidence underpinning this advice is unclear. A systematic search was performed on current peer reviewed literature addressing advance notice periods, which found three r...

Objectives Up to a quarter of the world’s population experience chronic pain, which, in addition to interfering with daily activities and waking function, is often associated with poor sleep. Individuals experiencing poor sleep are often encouraged to implement sleep hygiene strategies. However, current sleep hygiene strategies have not been develo...

Background: Medication administration errors (MAEs) cause preventable patient harm and cost billions of dollars from already-strained healthcare budgets. An emerging factor contributing to these errors is nurse fatigue. Given medication administration is the most frequent clinical task nurses undertake; it is vital to understand how fatigue impact...

Objectives The global prevalence of Parkinsonism continues to rise given ageing populations. Individuals with Parkinsonism who have moderate or severe symptoms typically require a high level of care, including assistance with activities of daily living. This care is often provided across the 24-hour period by a family member or friend. It is likely...

Introduction Research and guidance materials addressing on-call work typically focus on a narrow set of industries (e.g., emergency services, healthcare). However, modern working arrangements are changing. The casualisation of many industries, combined with the rise in online and app-based working arrangements, means that many workers who can be ca...

Introduction Fatigue Risk Management Systems (FRMS) are increasingly being used in a range of safety-critical industries to manage fatigue-related risk. These data-driven practices use a risk-based approach to managing fatigue, rather than solely relying on prescriptive hours of work limits. However, some organisations are reluctant to implement FR...

The 'first night effect' refers to individuals experiencing poorer sleep during their first night in a laboratory. The effect is attributed to sleeping in a new environment, as well as wearing electrodes on the head and face, and is often cited as a reason for including an adaptation night in sleep research protocols. However, in the time since the...

BACKGROUND:The challenges of climate change and increasing frequency of severe weather conditions has demanded innovative approaches to wildfire suppression. Australia's wildfire management includes an expanding aviation program, providing both fixed and rotary wing aerial platforms for reconnaissance, incident management, and quick response aerial...

Globally, over a billion tonnes of food is diverted to waste streams every year. To design and implement strategies to minimise food waste, it is critical to understand current food waste behaviours, including what, and how much, food is being wasted at the household level. The gold standard method to measure household waste involves the collection...

Although social acceptance of same sex parenting in Australia has improved, prejudice toward same sex parented families still exists. Using the contact hypothesis as a theoretical framework, the aim of this mixed methods study was to investigate the influence that personal contact with lesbian, gay, bisexual, transgender, queer, and intersex (LGBTQ...

Introduction : Today’s adolescents are growing up in a unique sociocultural climate in which gender issues are highly prominent. Alongside new ways of understanding gender identity, there are persistent gender disparities in social, health and mental health outcomes despite increasingly egalitarian views and a significant public focus on sexual ass...

Fatigue-related motor vehicle crashes are common worldwide and have been addressed by a range of road safety campaigns. These campaigns are typically directed towards at-risk groups (e.g., heavy vehicle drivers), who may be likely to experience fatigue resulting from reduced or disrupted sleep opportunities. Another population likely to experience...

Chronotype can be defined as an overt expression of circadian rhythmicity in an individual that dictates tendencies towards being a morning or evening person - also referred to as 'morningness' or 'eveningness.' Chronotypes generally impact preferred bed and wake times, in addition to a range of personal and social factors. This study examined how...

Objectives: There is increased recognition that young people (<25 years) may occupy a carer role for family or others with health conditions or disability. This is often in addition to study and social activities. This means competing demands on time, and insufficient sleep. Our aim was to determine the contribution of caring duties to problematic...

Unpaid caregivers often experience sleep impairments as an unintended consequence of providing care. This systematic review and meta-analysis investigated the efficacy of interventions to improve sleep in unpaid caregivers. Six databases were searched from journal inception to 7-Sep-2021 to identify randomised controlled trials. Random-effects meta...

Gig work is a type of contingent work which has increased markedly in recent times, and is characterised by uncertainty, unpredictability, and instability of both schedules and income earned. Gig workers are also likely to work for multiple platforms and/or employers. These work characteristics mean that performing gig work is associated with highe...

Background: Sleep and wellness outcomes have been explored in elite netball athletes, but research examining these outcomes in sub-elite athletes is lacking despite high participation rates at the sub-elite level. The aim was to investigate the impact of the scheduling of games over consecutive days during a truncated four-round netball competitio...

Background On-call research and guidance materials typically focus on ‘traditional’ on-call work (e.g., emergency services, healthcare). However, given the increasing prevalence of non-standard employment arrangements (e.g., gig work and casualisation), it is likely that a proportion of individuals who describe themselves as being on-call are not i...

Due to the unpredictable nature of working time arrangements, on-call workers experience regular disruption to sleep, particularly if woken by calls. Sleep disruption can impact long term physical and mental health, next day performance, and importantly, performance immediately after waking. To reduce the impact of performance impairments upon waki...

Objective Fatigue Risk Management Systems (FRMS) are a data-driven set of management practices for identifying and managing fatigue-related safety risks. This approach also considers sleep and work time, and is based on ongoing risk assessment and monitoring. This narrative review addresses the effectiveness of FRMS, as well as barriers and enabler...

Boarding schools, by definition, house students in residence either on campus or close by in residential facilities - where the sleep environment is likely to differ from their home environment. For boarders, being in the boarding environment occurs alongside a convergence of psychosocial and physiological factors likely to impact adolescent sleep....

Objective: The sleep of individuals who provide unpaid care for children with medical needs is likely to be significantly impacted by this role. Sleep may be affected by the practical tasks undertaken during the night (e.g., administering medication), in addition to the emotional impact (e.g., worry, rumination). The aim of this systematic review...

In developed countries, deaths attributable to driving or working while intoxicated have steadily declined over recent decades. In part, this has been due to (a) public education programs about the risks and (b) the deterrence value associated with penalties and prosecutions based on an individual being ‘deemed impaired’ if they exceed a proscribed...

Research has indicated that individuals with certain traits may be better suited to shiftwork and non-standard working arrangements. However, no research has investigated how individual differences impact on-call outcomes. As such, this study investigated the impact of trait anxiety on sleep and performance outcomes on-call. Seventy male participan...

Background On-call working arrangements have been shown to negatively impact sleep. However, workers may perceive their sleep to be worse than it actually is. The aim of this study was to compare participants’ pre- and post-sleep estimates of sleep duration and sleep quality with objectively measured sleep when on-call under laboratory conditions....

Introduction Prolonged sitting and inadequate sleep are a growing concern in society and are associated with impairments to cardiometabolic health and cognitive performance. However, the combined effect of prolonged sitting and inadequate sleep on measures of health and cognitive performance are unknown. In addition, the circadian disruption caused...

Firefighters are exposed to numerous stressors during wildfire suppression, including working in hot temperatures and sleep restricted conditions. Research has shown that when sleep restricted, individuals choose foods higher in carbohydrates, fat, and sugar, and have increased cravings for calorie dense foods. However, there is currently no resear...

Objective: On-call work is becoming increasingly common in response to service demands. This study had two aims; 1) describe the demographic profile of on-call workers in Australia, and 2) establish the impacts of on-call work on workers’ sleep. Methods: A cross-sectional study was conducted using an online questionnaire completed by Australian on-...

Sleep inertia, the state of reduced alertness upon waking, can negatively impact on-call workers. Anticipation of a stressful task on sleep inertia, while on-call was investigated. Young, healthy males (n = 23) spent an adaptation, control and two counterbalanced on-call nights in the laboratory. When on-call, participants were told they would be w...

Objective: This study had two specific objectives, 1) to investigate the impact of being on-call on overnight heart rate variability during sleep and; 2) to examine whether being on-call overnight impacted next-day salivary cortisol concentrations. Methods: Data are reported from three within-subject laboratory studies (n = 24 in each study) tha...

Introduction On-call schedules are associated with stress and disrupted sleep. In a recent study, under non-sleep deprived conditions, low and high-stress on-call conditions did not significantly impact sleep quality but did impact next day performance. Our aim was to determine whether quantitative electroencephalography (qEEG) would reflect change...

This study investigated how the likelihood of missing an alarm affects pre-bed anxiety, sleep and next day cognitive performance during on-call shifts. Participants (n = 24) completed one adaptation night, one control night and two on-call nights in a time-isolated sleep laboratory. On one of the on-call nights, participants were informed that they...

On-call working arrangements are employed in a number of industries to manage unpredictable events, and often involve tasks that are safety- or time-critical. This study investigated the effects of call likelihood during an overnight on-call shift on self-reported pre-bed anxiety, sleep and next-day cognitive performance. A four-night laboratory-ba...

Emerging evidence from a number of laboratories indicates that humans have the ability to identify fatty acids in the oral cavity, presumably via fatty acid receptors housed on taste cells. Previous research has shown that an individual's oral sensitivity to fatty acid, specifically oleic acid (C18:1) is associated with body mass index (BMI), dieta...

To curtail the spread of wildfire, firefighters are often required to work long hours in hot, smoky conditions with little rest between consecutive shifts. In isolation, heat, smoke, and sleep disruption can have a detrimental impact on cognitive and physical abilities. Far less is known, however, about the combined impact that heat, smoke, and sle...