After several decades of research at La Trobe University into the mechanisms of circadian sleep-wake cycles, focusing particularly on melatonin and the pineal gland, Stuart took early retirement but retained his sleep clinics at the Epworth Sleep Centre and ARMC (Veterans Psychiatry Unit). He specializes in treating the insomnias and parasomnias (as well as their comorbidities).
Stuart chairs the ASA (Australasian Sleep Association) Education sub-committee on Behavioural Management of Sleep Disorders whose mandate is to train psychologists by workshops and seminars on how to treat and manage the insomnias, hypersomnias and parasomnias. Under the auspices of the APS, this has been carried out in all States.