title: Evaluation of a sleep switch device.
abstract: OBJECTIVE
  To evaluate the performance of a sleep switch device (held between finger and thumb) in normal sleepers and in insomniacs by comparing its performance to PSG data, wrist actigraphy, and subjective estimates.
  
  
  METHODS
  19 insomniacs and 6 normal sleepers each spent one night in the sleep laboratory. Sleep latency and total sleep time were evaluated by the sleep switch device, polysomnography, wrist actigraphy, and subjective estimates.
  
  
  METHODS
  NA.
  
  
  METHODS
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  METHODS
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  RESULTS
  The sleep switch device correlated .98 with PSG sleep latency (to the onset of the first 10 minutes of solid sleep, stage 1 or deeper). Mean and standard deviations were almost identical between the two measures. The sleep switch was somewhat less accurate than the wrist actigraph in assessing total sleep time.
  
  
  CONCLUSIONS
  The sleep switch device is a very accurate and inexpensive tool when trying to assess sleep latency in insomniacs and in normals.
authors.affiliation: Mayo Sleep Disorders Center, Rochester, MN 55905, USA. Hauri.Peter@mayo.edu
authors.forename: P J
authors.initials: PJ
authors.lastname: Hauri
mesh_terms: D000328:Adult; D000368:Aged; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D017286:Polysomnography / Q000295:instrumentation*; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis; D012895:Sleep, REM / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology