PMID: 11902434Mar 21, 2002Paper

Nightcap: a reliable system for determining sleep onset latency

Sleep
Jose L CanteroJ A Hobson

Abstract

Previous studies have demonstrated that the Nightcap home-based sleep-monitoring system can differentiate waking, NREM and REM sleep based on eyelid movements (ELMs) and head movement behavior. The present study aims at determining the reliability of the Nightcap in determining the human sleep onset latency (SOL) as revealed by standard polysomnography (PSG). Four naps were recorded in each of ten normal subjects using both PSG and the Nightcap simultaneously. The Nightcap algorithm scored sleep onset as the first of 4 consecutive 30-sec epochs with less than 5 ELMs. The mean percentage of agreement between the Nightcap and PSG was 93% (k = 0.79), and the average absolute difference was 45 sec (13.3% of SOL(PSG)). SOL(NC) differed by less than 1 min in 85% of onsets. Recordings of EEG activity from 90 sec before and after PSG-identified sleep onsets were subjected to spectral analysis. Changes in spectral power in the theta (4-7 Hz) and alpha (8-12 Hz) frequency bands during the transition into light sleep correlated well with eyelid behavior. However, changes in ELM density predicted sleep onset better than did changes in theta and alpha spectral power. These results suggest that the Nightcap may be a potential alternative to ...Continue Reading

Citations

Sep 5, 2002·Nature Reviews. Neuroscience·J Allan Hobson, Edward F Pace-Schott
Jan 6, 2006·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Carl L HartRichard W Foltin
Oct 19, 2011·Behavioral Sleep Medicine·Salvatore P InsanaHawley E Montgomery-Downs
Apr 20, 2017·Cognitive Science·Jana SpethClemens Speth
Jan 27, 2005·Psychopharmacology·Edward F Pace-SchottJ Allan Hobson
Jun 4, 2004·Journal of Sleep Research·Russell ConduitGrahame Coleman
May 13, 2018·Applied Psychophysiology and Biofeedback·Bhavna P Harne, A S Hiwale
Jan 25, 2008·Applied Psychophysiology and Biofeedback·Agnes S ChanMei-Chun Cheung
Mar 5, 2004·Journal of Sleep Research·Mercedes AtienzaJ Allan Hobson
Aug 19, 2007·The Journal of Nervous and Mental Disease·Ruth E PropperSarah Olejarz
Dec 13, 2005·Proceedings of the National Academy of Sciences of the United States of America·Elliot M FriedmanCarol D Ryff
Sep 4, 2007·Psychosomatic Medicine·Elliot M FriedmanCarol D Ryff
May 29, 2002·Nature Neuroscience·Sara C MednickRobert Stickgold
May 25, 2005·Journal of Sleep Research·Luigi De GennaroCristiano Violani
Feb 15, 2005·Applied Psychophysiology and Biofeedback·Gregg D Jacobs, Richard Friedman

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