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Continue ShoppingLevel 2 Sleep Study
What is a Level-2 PSG?
A Level-2 sleep study is a full, multi-channel sleep test (similar to in-lab PSG) but often done outside the lab.
It records brain activity, breathing, heart activity, oxygen, movement, and blood pressure to detect sleep disorders.
Parameters Measured
Level 2 PSG provides comprehensive analysis across 9 categories with 43+ parameters
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1. Basic Sleep Structure Parameters
Sleep / Wake Areas
Periods of sleep vs wake across the night
Shows sleep continuity, insomnia, and fragmentation
Raster View – Activity
Visual timeline of movements, sleep stages, breathing
Quick overview of sleep quality & disturbances
Sleep Stages (N1, N2, N3, REM)
Percentage/time spent in each stage
Normal sleep needs balanced stages; imbalance indicates disorders
Total Sleep Time (TST)
Total minutes actually asleep
Core measure of sleep quantity
Sleep Efficiency
(Total sleep time ÷ Time in bed) × 100
≥85% = good sleep. Low value = insomnia or fragmentation
Sleep Latency
Time to fall asleep
Long latency → insomnia, anxiety. Very short → sleep deprivation
Sustained Sleep Efficiency
Sleep efficiency after initial sleep onset
Shows sleep maintenance quality
Deep Sleep Latency
Time to reach N3 sleep
Deep sleep is essential for physical recovery
REM Latency
Time from sleep onset to first REM
Short REM latency → depression, narcolepsy. Long latency → medications, stress
Sleep Stage Changing
Number of stage transitions
High changes = unstable sleep
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2. Arousals & Wake Parameters
Number of Wakings
Count of awakenings
Fragmented sleep reduces quality
Wake Durations
Total wake time after sleep onset
Helps diagnose maintenance insomnia
Arousals (Cortical & Autonomic)
EEG arousals + heart/breath changes
Key marker of sleep fragmentation. Often caused by apnea or PLM
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3. Brain Activity Analysis
Spindle Report
Sleep spindle count & density
Memory consolidation. Reduced in aging, insomnia
Delta Progression Function
Deep sleep (delta wave) evolution
Reflects sleep depth & recovery
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4. Heart Rate & Autonomic Function
RR Interval (Time in Bed)
Beat-to-beat heart timing
Autonomic balance during sleep
RR Interval (Complete Recording)
Overall HR variability
Stress, cardiac risk, sleep quality
Advanced Statistics
HRV indices, nonlinear metrics
Detects autonomic dysfunction
Stress Report
Sympathetic vs parasympathetic activity
Chronic stress disrupts sleep
Spectral Analysis of RR
LF/HF ratio
Measures autonomic nervous system balance
Heart Rate
Average & variation during sleep
Elevated HR = arousals, apnea
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5. Respiratory Parameters
Respiratory Analysis
Apneas, hypopneas, airflow
Diagnoses sleep apnea
Snoring Analysis
Frequency & intensity
Indicator of airway obstruction
Phase Angle Analysis
Chest vs abdomen movement timing
Detects obstructive vs central apnea
Breathing Frequency
Breaths per minute
Abnormal rate signals respiratory disorder
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6. Oxygen & Position
Oxygen Saturation with Body Positions
SpO₂ drops in different postures
Positional sleep apnea detection
Body Position
Supine, lateral, prone time
Supine worsens apnea
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7. Blood Pressure & Cardiovascular Risk
Blood Pressure Day/Night
Circadian BP variation
Night BP should drop
Systolic / Diastolic BP
Pressure levels
Hypertension risk
MAP (Mean Arterial Pressure)
Average organ perfusion pressure
Cardiovascular health
PP (Pulse Pressure)
Systolic – Diastolic
Arterial stiffness
BP Dipping Patterns
Reverse dipper, Non-dipper, Dipper, Extreme dipper
Strong predictor of stroke & heart disease
Conventional BP Recording
Standard BP measurements
Baseline comparison
Nocturnal BP Fluctuations (NBPF)
BP variability at night
Autonomic instability
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8. Vascular Function
Pulse Transit Time
Time for pulse wave to travel
Non-invasive BP & stiffness marker
PWV (Pulse Wave Velocity)
Arterial stiffness
Cardiovascular risk assessment
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9. Movement Disorders
Periodic Limb Movement (PLM) & Distribution
Limb jerks per hour
Causes arousals & poor sleep quality
WHY ALL THESE PARAMETERS ARE IMPORTANT
- ✔ Accurate diagnosis of sleep disorders
- ✔ Identification of cardiovascular risk
- ✔ Assessment of sleep quality & recovery
- ✔ Detection of autonomic and respiratory dysfunction
*Home setup available. Device installation and usage guidance included.
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