Quantified Sleep - Science behind the sleep trackers
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Transcript of Quantified Sleep - Science behind the sleep trackers
Emer O’HareM.E. Biomedical Engineering
B.E. Electronic Engineering
Overview:My Sleep LearningsSleep MeasurementSleep ApneaSleep differences
My Sleep Learnings:Pre-sleep food/drink Changes in body
temperature
National Centre of Sleep Disorders Research (USA)
PolysomnographyAdvantages Disadvantage
sVery accurate
Multiple measures
Detailed analysis
Clinical practice
Supervision required (Expensive)
Intrusive
Human scoring (subjective)
Typically one night (no trends)
paradisesleep.com
Sleep Stages:Stage PSG OtherWake • EEG low
voltage, fast and random
• EEG Beta/Alpha waves
• Active limb/torso movement
• Variation in breathing and heart rate
Light Sleep
• EEG theta waves
• EEG Sleep spindles and K complexes
• Reduced limb/torso movement
• Reduced variation in breathing and heart rate
Deep Sleep
• EEG Delta waves
• No limb/torso movement
• Very regular and slower breathing and heart rate
REM • EEG low voltage, fast and sawtooth waves
• EOG movement
• No limb/torso movement
• Variation in breathing and heart rate
http://www.slideshare.net/ashrafeladawy/sleep-disordered-breathing
Sleep Apnea:Pickwickian Syndrome (1836) Obstructive Sleep Apnea
Sleep Apnea Diagram from msunites.com
Obstructive Sleep Apnea:Clinical thresholds:
http://www.slideshare.net/ashrafeladawy/sleep-disordered-breathing
AHI Value Category<5 Normal5-15 mild15-30 moderate>30 severe
Sleep DifferencesSleep duration: Sleep and age
2007, Loughborough Sleep Research Centre on-line sleep survey (Professor Jim Horne)
http://sleepdisorders.sleepfoundation.org
Thanks