Sleep symptoms alone do not always reveal the cause. Sleep studies provide objective information about breathing, oxygen, sleep stages, movement and daytime sleep tendency. Selecting the correct test helps a specialist recommend appropriate sleep disorder treatment.
Polysomnography
Polysomnography is an overnight study performed in a sleep laboratory. Small sensors record brain waves, eye movements, chin and leg muscle activity, airflow, breathing effort, oxygen level and heart rhythm. A trained technologist monitors signal quality and patient safety. The study is non-invasive, although sleeping with sensors may feel unfamiliar.
Home sleep apnoea testing
A home sleep apnoea test records a smaller set of signals, usually including breathing, airflow and oxygen. It may be suitable for selected adults with a strong likelihood of uncomplicated obstructive sleep apnoea. It does not diagnose every sleep disorder, and a negative or unclear result may still require laboratory polysomnography.
Multiple Sleep Latency Test
The Multiple Sleep Latency Test is performed during the day, usually after an overnight laboratory study. It measures how quickly a person falls asleep during a series of scheduled nap opportunities and whether REM sleep appears unusually early. It is used in the evaluation of narcolepsy and selected hypersomnolence disorders.
Actigraphy and sleep diaries
Actigraphy uses a wrist-worn movement sensor to estimate rest and activity across days or weeks. Together with a sleep diary, it helps evaluate sleep timing, insufficient sleep and circadian rhythm patterns. It does not replace polysomnography when detailed physiological information is required.
Preparing for a sleep test
- Follow the sleep centre’s instructions about caffeine, alcohol and hair or skin products.
- Bring a current list of medicines and do not stop treatment unless instructed by your clinician.
- Maintain the requested sleep schedule before daytime sleepiness testing.
- Tell the team about allergies, mobility needs or medical equipment.
Understanding the results
A sleep specialist interprets the recorded signals together with symptoms and medical history. One number rarely tells the whole story. The report may describe breathing-event frequency, oxygen changes, sleep efficiency, limb movements, heart rhythm and sleep-stage patterns.
From testing to treatment
Results can guide positive airway pressure settings, oral-appliance referral, behavioural treatment, further neurological evaluation or other personalised care. Ask what the findings mean, what treatment is recommended and how response will be followed.
Nithra Health offers sleep evaluation and testing to help identify the cause of ongoing sleep problems.
This information is educational and not individual medical advice.
