Personal profile


Sleep is increasingly recognised as the third pillar of good health, along side diet and exercise. Poor sleep quality and sleep deficiency are linked to a number of serious health problems, including depression and cardiovascular disease, as well as impaired alertness and neurocognitive functioning, reduced productivity and increased accident risk.

Our research program aims to investigate the role of the internal biological clock in the regulation of the sleep-wake cycle, and how disruption of the clock leads to sleep disorders and other physiological consequences (for example, in shift workers). We are developing novel treatment approaches for sleep disorders that are caused by biological clock disruption. These include light and melatonin treatments. We are also investigating the contribution of sleep disturbances and fatigue to mood disorders and impaired cognition in clinical populations.

Sleep loss and impaired alertness adversely affect occupational safety, health and productivity, and also road safety. About 20 percent of serious car crash injuries are associated with driver sleepiness. Our research is examining innovative technologies to monitor alertness in occupational and transportations settings, and is developing and testing intervention strategies aimed at reducing the burden associated with impaired alertness in these contexts.

Community service

2011-present President, Australasian Sleep Association

Research interests

  • Circadian regulation of sleep and wakefulness
  • Effects of melatonin and melatonin agonists on sleep and circadian rhythms
  • Effects of light on the human circadian system
  • Consequences of sleep loss and sleep disruption in neuropsychiatric disorders
  • Development of interventions for sleep loss and sleepiness in transport and occupational settings
  • Legal issues relating to sleep loss and sleepiness

Monash teaching commitment

2011-present Director of Undergraduate Programs, School of Psychology and Psychiatry


  • Circadian rhythms
  • Insomnia
  • Light
  • Melatonin
  • Shift work
  • Sleep
  • Sleep Loss
  • Sleep disorders
  • Sleepiness-related crashes

Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Projects 2003 2021

Research Output 1997 2017

Delayed sleep phase disorder: Mechanisms and treatment approaches: Mechanisms and treatment approaches

Murray, J. M., Sletten, T. L., Magee, M. & Rajaratnam, S. M. W. 1 Jan 2017 Biological Timekeeping: Clocks, Rhythms and Behaviour. Kumar, V. (ed.). India: Springer, p. 315-334 20 p.

Research output: Other - peer-reviewChapter (Book)

Randomized, prospective study of the impact of a sleep health program on firefighter injury and disability

Sullivan, J. P., O'Brien, C. S., Barger, L. K., Rajaratnam, S. M. W., Czeisler, C. A., Lockley, S. W. & Harvard Work Hours, Health and Safety Group 1 Jan 2017 In : Sleep. 40, 1, 10 p., zsw001

Research output: Research - peer-reviewArticle

Open Access