Medical Glossary
Sleep Medicine Terminology
Comprehensive definitions of sleep medicine terms, conditions, treatments, and diagnostic procedures with clinical context.
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A
ACT
Diagnostic
Actigraphy
ASV
Treatment
Adaptive Servo-Ventilation (ASV)
Anatomical
Adenoids
T&A
Treatment
Adenotonsillectomy
ASPD
Condition
Advanced Sleep Phase Disorder
Physiological
Airway Collapse
Physiological
Airway Resistance
Physiological
Alpha Waves
Physiological
Apnea
AHI
Diagnostic
Apnea-Hypopnea Index (AHI)
AI
Diagnostic
Arousal Index
Physiological
Arousal Threshold
Arousal-RDI
Metric
Arousal-Respiratory Disturbance Index
Anatomical
Arytenoid Cartilages
Device
Auto-Titration Algorithm
APAP
Treatment
Automatic Positive Airway Pressure (APAP)
B
C
SAQLI
Diagnostic
Calgary Sleep Apnea Quality of Life Index (SAQLI)
Device
Central Apnea Detection
CSA
Condition
Central Sleep Apnea (CSA)
CSR
Condition
Cheyne-Stokes Respiration (CSR)
Device
Chin Strap
CRSD
Condition
Circadian Rhythm Sleep Disorders
Device
Clear Airway Apnea
CompSAS
Condition
Complex Sleep Apnea Syndrome
Device
Compliance Data
Device
Compliance Monitoring
Metric
Compliance Rate
Condition
Confusional Arousals
CPAP
Treatment
Continuous Positive Airway Pressure (CPAP)
Treatment
CPAP Desensitization
Device
Cycle Sensitivity
D
E
Device
Efficacy Data
ECG
Diagnostic
Electrocardiography (ECG/EKG)
EEG
Diagnostic
Electroencephalography (EEG)
EMG
Diagnostic
Electromyography (EMG)
EOG
Diagnostic
Electrooculography (EOG)
ETCO2
Diagnostic
End-Tidal CO2 (ETCO2)
EPAP
Device
EPAP (Expiratory Positive Airway Pressure)
Anatomical
Epiglottis
ESS
Diagnostic
Epworth Sleepiness Scale (ESS)
Device
Event Detection
EDS
Condition
Excessive Daytime Sleepiness (EDS)
EHS
Condition
Exploding Head Syndrome
F
H
Anatomical
Hard Palate
HRV
Metric
Heart Rate Variability (HRV)
Treatment
Heated Humidification
HFNC
Treatment
High Flow Nasal Cannula (HFNC)
HSAT
Diagnostic
Home Sleep Apnea Test (HSAT)
Device
Hybrid Mask
Anatomical
Hyoid Bone
Treatment
Hyoid Suspension
Physiological
Hypercapnia
Condition
Hypnic Jerks
Diagnostic
Hypnogram
HNS
Treatment
Hypoglossal Nerve Stimulation
Anatomical
Hypopharynx
Physiological
Hypopnea
Device
Hypopnea Detection
Physiological
Hypoxia
I
L
M
MWT
Diagnostic
Maintenance of Wakefulness Test (MWT)
Diagnostic
Mallampati Score
Anatomical
Mandible
MAD
Treatment
Mandibular Advancement Device (MAD)
Device
Mask Interface
Device
Mask Leak
Anatomical
Maxilla
MMA
Treatment
Maxillomandibular Advancement (MMA)
Mean SpO2
Metric
Mean Oxygen Saturation
Condition
Microsleep
MV or VE
Metric
Minute Ventilation
MSLT
Diagnostic
Multiple Sleep Latency Test (MSLT)
Treatment
Myofunctional Therapy
N
Metric
Nadir SpO2
Condition
Narcolepsy
Treatment
Nasal EPAP
Device
Nasal Mask
Device
Nasal Pillows
Diagnostic
Nasal Pressure Transducer
Anatomical
Nasal Septum
Treatment
Nasal Surgery
Anatomical
Nasal Valve
Anatomical
Nasopharynx
Metric
Neck Circumference
Condition
Night Terrors
Condition
Nocturia
Condition
Nocturnal Asthma
Condition
Nocturnal Hypoxemia
Condition
Nocturnal Panic Attacks
N24SWD
Condition
Non-24-Hour Sleep-Wake Disorder
Metric
Non-Supine AHI
Metric
NREM AHI
Physiological
NREM Sleep
O
OHS
Condition
Obesity Hypoventilation Syndrome (OHS)
Device
Obstructive Apnea Detection
OSA
Condition
Obstructive Sleep Apnea (OSA)
OAT
Treatment
Oral Appliance Therapy (OAT)
Treatment
Oropharyngeal Exercises
Anatomical
Oropharynx
ODI
Diagnostic
Oxygen Desaturation Index (ODI)
SpO2
Physiological
Oxygen Saturation (SpO2)
Treatment
Oxygen Therapy
P
Treatment
Palatal Implants
Anatomical
Palatoglossus Muscle
Anatomical
Palatopharyngeus Muscle
Condition
Parasomnias
PLMD
Condition
Periodic Limb Movement Disorder (PLMD)
PLMI
Metric
Periodic Limb Movement Index (PLMI)
Pcrit
Physiological
Pharyngeal Critical Closing Pressure (Pcrit)
Anatomical
Pharynx
Condition
Pickwickian Syndrome
PSQI
Diagnostic
Pittsburgh Sleep Quality Index (PSQI)
PSG
Diagnostic
Polysomnography (PSG)
Treatment
Positional Therapy
PAP
Device
Positive Airway Pressure (PAP)
Device
Pressure Range
Treatment
Pressure Relief Technology
Device
Pressure Setting
PS
Device
Pressure Support
Device
Pressure Waveform
Condition
Primary Snoring
SpO2
Diagnostic
Pulse Oximetry
R
RFA
Treatment
Radiofrequency Ablation (RFA)
Treatment
Ramp Feature
Metric
REM AHI
Physiological
REM Atonia
REML
Diagnostic
REM Latency
REM%
Metric
REM Percentage
REM
Physiological
REM Sleep
RBD
Condition
REM Sleep Behavior Disorder (RBD)
Device
RERA Detection
Device
Residual AHI
RDI
Diagnostic
Respiratory Disturbance Index (RDI)
Physiological
Respiratory Effort
RERA
Diagnostic
Respiratory Effort Related Arousal (RERA)
RIP
Diagnostic
Respiratory Inductance Plethysmography (RIP)
RR
Metric
Respiratory Rate
RLS
Condition
Restless Legs Syndrome (RLS)
Anatomical
Retroglossal Space
Anatomical
Retropalatal Space
Device
Rise Time
S
Treatment
Septoplasty
SWSD
Condition
Shift Work Sleep Disorder
Diagnostic
Sleep Architecture
Condition
Sleep Debt
Condition
Sleep Deprivation
Diagnostic
Sleep Diary
SE
Diagnostic
Sleep Efficiency
Condition
Sleep Enuresis
Condition
Sleep Fragmentation
Device
Sleep Histogram
Treatment
Sleep Hygiene
Condition
Sleep Inertia
SL
Diagnostic
Sleep Latency
Condition
Sleep Maintenance Insomnia
SOL
Metric
Sleep Onset Latency (SOL)
Condition
Sleep Paralysis
Physiological
Sleep Spindles
Diagnostic
Sleep Stage Scoring
Somniloquy
Condition
Sleep Talking (Somniloquy)
Somnambulism
Condition
Sleep Walking (Somnambulism)
SRED
Condition
Sleep-Related Eating Disorder
Condition
Sleep-Related Epilepsy
Sleep-Related GERD
Condition
Sleep-Related Gastroesophageal Reflux
Condition
Sleep-Related Hallucinations
Condition
Sleep-Related Hypoventilation
Condition
Sleep-Related Leg Cramps
Condition
Sleep-Related Movement Disorders
SWS
Physiological
Slow Wave Sleep (SWS)
Device
Snore Detection
Diagnostic
Snoring Scale
Anatomical
Soft Palate
N1%
Metric
Stage N1 Percentage
N2%
Metric
Stage N2 Percentage
N3%
Metric
Stage N3 Percentage
STOP-BANG
Diagnostic
STOP-BANG Questionnaire
Metric
Supine AHI
Anatomical
Supraglottic Structures
T
TMJ
Anatomical
Temporomandibular Joint (TMJ)
Diagnostic
Thermistor
TV or VT
Metric
Tidal Volume
T90
Metric
Time Below 90% SpO2 (T90)
TIB
Metric
Time in Bed (TIB)
Ti
Device
Timed Inspiration
Anatomical
Tongue Base
TRD
Treatment
Tongue Retaining Device (TRD)
Anatomical
Tonsils
TST
Diagnostic
Total Sleep Time (TST)
Treatment
Tracheostomy
TcCO2
Diagnostic
Transcutaneous CO2 (TcCO2)
TECSA
Condition
Treatment-Emergent Central Sleep Apnea
Device
Trigger Sensitivity
Treatment
Turbinate Reduction
Anatomical
Turbinates
U
About Our Medical Glossary
This comprehensive glossary of sleep medicine terminology is maintained by our team of sleep specialists and regularly updated with the latest medical research and definitions.
For Healthcare Professionals
Our glossary provides evidence-based definitions and clinical guidelines references that align with AASM standards.
- ICD-10 and CPT code references
- Clinical measurement values
- Diagnostic criteria