SlideShare a Scribd company logo
M.E. Biomedical Engineering
B.E. Electronic Engineering
Overview:
 My Sleep Learnings
 Sleep Measurement
 Sleep Apnea
 Sleep differences
My Sleep Learnings:
Pre-sleep food/drink Changes in body temperature
National Centre of Sleep Disorders Research (USA)
Polysomnography
Advantages Disadvantages
Very 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 Other
Wake • 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 Normal
5-15 mild
15-30 moderate
>30 severe
Sleep Differences
Sleep duration: Sleep and age
2007, Loughborough Sleep Research Centre on-line
sleep survey (Professor Jim Horne)
http://sleepdisorders.sleepfoundation.org
Quantified Sleep - Science behind the sleep trackers

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Quantified Sleep - Science behind the sleep trackers

  • 1. M.E. Biomedical Engineering B.E. Electronic Engineering
  • 2. Overview:  My Sleep Learnings  Sleep Measurement  Sleep Apnea  Sleep differences
  • 3. My Sleep Learnings: Pre-sleep food/drink Changes in body temperature National Centre of Sleep Disorders Research (USA)
  • 4. Polysomnography Advantages Disadvantages Very accurate Multiple measures Detailed analysis Clinical practice Supervision required (Expensive) Intrusive Human scoring (subjective) Typically one night (no trends) paradisesleep.com
  • 5. Sleep Stages: Stage PSG Other Wake • 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
  • 6. Sleep Apnea: Pickwickian Syndrome (1836) Obstructive Sleep Apnea Sleep Apnea Diagram from msunites.com
  • 7. Obstructive Sleep Apnea: Clinical thresholds: http://www.slideshare.net/ashrafeladawy/sleep- disordered-breathing AHI Value Category <5 Normal 5-15 mild 15-30 moderate >30 severe
  • 8. Sleep Differences Sleep duration: Sleep and age 2007, Loughborough Sleep Research Centre on-line sleep survey (Professor Jim Horne) http://sleepdisorders.sleepfoundation.org