Frequently Asked Questions

Excessive Sleepiness

What are the symptoms of Idiopathic Hypersomnia? Back to top

Patients with IH do not experience cataplexy, sleep paralysis or hypnagogic hallucinations. They wake in the morning feeling tired and drowsy, and it can take several hours before feeling alert. They feel extremely sleepy and the need to take naps during the day is almost overwhelming. It is co...

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What are some of the symptoms of Narcolepsy? Back to top

Symptoms that may occur in narcolepsy (but not always):

  • Cataplexy - a sudden loss of muscle tone, often triggered by laughing, crying or strong emotions.
  • Sleep paralysis - this usually occurs when waking up in the morning and lasts usually for 1 minute or less. It can be a fr...

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What disorders causing excessive sleepiness? Back to top

Narcolepsy and idiopathic hypersomnia (IH) are relatively uncommon sleep disorders. They are similar to each other - both are characterised by excessive daytime sleepiness. Distinguishing the two conditions can be quite difficult and requires the expertise of a sleep physician.

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Dr Adrian Chazan


Dr Chazan is a Respiratory & Sleep Physician, and General Physician. Born in Melbourne, he undertook his basic medical training at the University of Melbourne. With a passion for sleep and breathing, he trained at world-renowned centres of excellence in Melbourne and Sydney, including Westmead Hospital, the Alfred Hospital and Monash Medical Centre. Adrian has been involved in research activities in the fields of sleep apnoea, chronic obstructive pulmonary disease and exercise physiology.

Adrian utilises the latest findings in sleep research as well as the emerging technologies in diagnosis and treatment. He takes a patient-centered approach to medical care with the aim of empowering his patients to achieve better sleep and optimal long-term health outcomes.

Dr Calvin Sidhu


Dr Sidhu completed his Bachelor of Medicine at the University of Newcastle (NSW). He undertook his Physician training at Westmead Hospital (Sydney) and Specialist training in Victoria.

He has completed additional training in Interventional Pulmonology and Pleural Medicine at Sir Charles Gairdner Hospital (Perth) and Palliative Medicine (NSW). He has obtained required skills for bronchoscopies (respiratory endoscopies), endobronchial ultrasound (EBUS) and pleural procedures. He has relevant experience in managing general respiratory conditions, emphysema-COPD, severe asthma, bronchiectasis, lung tumors, enlarged chest lymph nodes (mediastinal lymphadenopathy) and pleural conditions (pneumothorax , pleural effusions) and incorporating procedural treatments if appropriate.

He currently also hold a honorary position as a Sleep Medicine fellow at Monash Hospital.