Level 2 Home Sleep Study:
A Detailed Look at Sleep and Breathing
A home sleep study can mean different things. A Level 2 recording includes signals that identify sleep stages as well as breathing and oxygen levels. Understanding the test helps you know why it was recommended and what its results can answer.
Medically reviewed and approved by Dr G Sarwar Chaudhry, MBBS, FRACP (Australia), FCCP (USA) — Consultant Pulmonologist and Sleep Physician. Reviewed 8 October 2026.
What does “Level 2” mean?
Level 2 polysomnography is a detailed, unattended sleep recording. It includes sleep-stage signals along with respiratory and other measurements. Level 1 polysomnography is attended by a technologist who can check signals and respond during the night. [1][2]
Australian Polyclinic offers Level 2 home studies for suitable patients using its SOMNOmedics system. Clinical review determines the appropriate test. A home location alone does not define the study level; the signals recorded and supervision arrangements matter.
What is recorded during the night?
Sleep stages and disruptions
EEG records brain activity. Eye-movement and chin-muscle signals help identify wakefulness, non-REM and REM sleep, and brief arousals.
Breathing
Airflow sensors and chest/abdominal effort belts help assess breathing events and whether respiratory effort continues when airflow falls.
Oxygen and heart activity
A finger sensor tracks oxygen saturation. ECG records heart electrical activity during sleep; concerning findings may need separate cardiac assessment.
Movement and position
Leg-muscle channels can identify repeated limb movements. Position and snoring signals provide additional context.
The precise montage depends on the equipment and clinical request. A headline channel count does not, by itself, establish quality or diagnostic capability. Signal quality, correct scoring and interpretation also matter. [1][3]
How does it compare with other overnight tests?
| Assessment | What distinguishes it? |
|---|---|
| Level 1 attended PSG | Detailed recording with a technologist present; additional measurements or interventions can be selected. |
| Level 2 home PSG | Sleep-stage and breathing signals recorded without continuous bedside supervision. |
| Limited home breathing test | Usually records airflow, effort and oxygen, without EEG-based sleep staging. It can diagnose OSA in appropriately selected adults. |
| Overnight oximetry | Records oxygen and pulse trends, with a more limited scope. |
Overnight oximetry alone cannot reliably confirm or exclude obstructive sleep apnoea. Your doctor selects a test for the question being investigated. [1][2]
Who may benefit from a detailed sleep study?
Loud snoring with witnessed breathing pauses, waking with choking or gasping, and unexplained daytime sleepiness can prompt assessment for obstructive sleep apnoea. A consultation considers other possible causes before testing. [1]
Some people need an attended study or a different investigation, particularly when complex breathing problems, significant coexisting illness or unusual night-time events are suspected. Severe insomnia can also affect test selection. Guidance about limited home breathing tests should not be assumed to apply identically to every Level 2 study. [2]
Sleepy while driving? Stop driving and seek prompt clinical advice. Do not wait for a study before addressing the immediate risk.
What can this test not establish on its own?
Restless legs syndrome
RLS is diagnosed primarily from the clinical history, including the urge to move the legs at rest. Leg movements recorded during sleep do not, by themselves, diagnose RLS. They may support assessment of periodic limb movements. [4]
A night with detached sensors, little sleep or an unrepresentative symptom pattern may be inconclusive. Home testing can feel convenient, but it does not guarantee more accurate results than a laboratory study.
From booking to your report
- Choose the right assessment. Discuss symptoms, medicines, previous reports and any CPAP or oxygen use with the clinician.
- Confirm the arrangements. Ask about fitting, any available home setup, fees, equipment return and the expected reporting time.
- Follow the preparation instructions. Keep hair and sensor sites clean; ask about caffeine, alcohol, naps and sleep medicines. Do not independently change prescribed treatment.
- Record overnight at home. Follow the fitting team's instructions. Note long periods awake, detached sensors and unusual symptoms.
- Return the equipment and review the findings. The recording is checked and interpreted in the context of your symptoms.
Our polysomnography and preparation guide provides practical details. Contact the sleep laboratory team for current booking arrangements. [5]
Understanding the results
The report may describe total sleep time, sleep stages, breathing events, oxygen changes, arousals and limb movements. When actual sleep is measured, the apnoea–hypopnoea index (AHI) expresses breathing events per hour of sleep. Limited tests without EEG may use monitoring time instead, which can affect the estimate. [2]
Your clinician considers the event pattern, symptoms, recording quality and other health conditions before advising treatment. Persistent symptoms with a normal, uncertain or technically inadequate result may require further investigation. If positive airway pressure is advised, our first-month CPAP guide explains common practical questions.
Level 2 home sleep study FAQs
Is this a Level 1 study at home?
The unattended detailed recording described here is Level 2. Attended Level 1 monitoring includes a technologist present during the night; that distinction matters.
Is a Level 2 study just an oxygen watch?
No. Level 2 polysomnography includes signals for sleep staging and breathing. An oxygen recording alone answers a more limited question.
Can leg sensors diagnose restless legs syndrome?
They record leg-muscle activity during sleep. RLS is primarily a clinical diagnosis, and periodic limb movements are not the same as RLS.
Will someone monitor me live overnight?
Do not assume that the clinic’s unattended recording is monitored live. Confirm support arrangements and what to do if a sensor comes loose.
Does a normal result end the investigation?
Not always. Ongoing symptoms or inadequate recordings may justify an attended study, repeat testing or a different assessment.
Related care and patient guides
Meet Dr G Sarwar Chaudhry, MBBS, FRACP (Australia), FCCP (USA), Consultant Pulmonologist and Sleep Physician.
Discuss your next step
Bring your medicine list and previous reports. Our team can help arrange the appropriate consultation and explain any test preparation.
First Floor, Building 19, CCA, DHA Phase 5, Lahore.
Clinic: Monday–Saturday, 2–9 pm. Dr Sarwar’s consultations: 4–8 pm. Sunday closed.
References and further reading
- NHLBI: Sleep studies
- AASM: Diagnostic testing for adult obstructive sleep apnoea (2017)
- AASM: Sleep medicine codes, including Type II study parameters
- AASM: Restless legs syndrome and periodic limb movement disorder guideline (2025)
- MedlinePlus: Sleep study and preparation
- AASM: Practice parameters for indications for polysomnography
General patient information. Individual diagnosis and treatment require clinical assessment.