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Testing light therapy of changing wavelength in adults suffering from sleep disorders to improve sleep quality, day time alertness, sleep wake patterns, mood and cognition.

Does using using light therapy improve daytime alertness and night-time sleep?

This research study is a laboratory-based study over 3 days and nights on two separate occasions.

The Clever Lights used in this study have been designed to emit specific wavelengths of light that regulate your circadian clock and your sleep. We are examining if using these lights will improve daytime alertness and night-time sleep.

If eligible for this research study, you will be invited to come to the Woolcock Institute of Medical Research in Glebe, NSW where you will stay in one of our sleep suites. Participants who are eligible for this study will be reimbursed $500 for their time provided they complete the study.


You may be eligible to participate in this study if you:

  • Able to give informed written consent
  • Fluent English speaker 
  • Older than 50 years 
  • Subjectively reported poor sleep quality (Pittsburgh Sleep Quality Index or PSQI >5)
  • Insomnia severity index (ISI) <15 indicating no clinically significant or subthreshold insomnia*
  • Multivariable apnoea prediction index (MAPI) ≤0.5 indicating a low probability of being diagnosed with obstructive sleep apnoea (OSA) and an Apnoea-Hypopnea Index (AHI) of <15/hr indicating no or mild obstructive sleep apnoea

How to participate

If you are interested in assisting with this important and exciting area of research, please check your suitability by completing the online survey or contact the study facilitator Matthew Rahimi for more information.