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Sleep/Wake Detection by Behavioral Response to Haptic Stimuli.

Katherine E Miller1,2, Linda Bäbler3, Thomas Maillart4

  • 1National Center for PTSD, Dissemination and Training Division, VA Palo Alto Healthcare System, Palo Alto, California.

Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine
|November 20, 2019
PubMed
Summary

This study shows a new device can detect wakefulness during sleep by responding to gentle touch, improving sleep efficiency estimates. This method may help overcome actigraphy

Keywords:
actigraphyambulatory measurementinsomniawakefulness

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Area of Science:

  • Sleep Science and Technology
  • Biomedical Engineering

Background:

  • Actigraphy is a primary tool for sleep phase disorder assessment but cannot detect movement-free wakefulness.
  • A limitation of actigraphy is its inability to distinguish between sleep and quiet wakefulness based on movement alone.

Purpose of the Study:

  • To evaluate a low-cost device for detecting wakefulness using instrumental responses to haptic stimuli.
  • To determine if this method can augment actigraphy for sleep efficiency estimation.

Main Methods:

  • Twenty adults participated in a 2-night laboratory polysomnography (PSG) study.
  • A wearable device ('Wakemeter') delivered haptic stimuli; participants responded by squeezing the device.
  • Stimulus/response data were compared with blinded PSG sleep scoring.

Main Results:

  • The Wakemeter was well-accepted by participants with minimal impact on sleep.
  • The device accurately detected wake epochs, even without movement, unlike actigraphy.
  • Sleep efficiency calculated from haptic responses strongly correlated with PSG estimates (rho = .69).

Conclusions:

  • Behavioral responses to haptic stimuli can identify movement-free wakefulness during sleep.
  • This method shows potential to enhance actigraphy for low-burden sleep efficiency estimation.
  • Further research is needed to establish long-term acceptability.