Actigraphy validation with insomnia.

@article{Lichstein2006ActigraphyVW,
  title={Actigraphy validation with insomnia.},
  author={Kenneth L. Lichstein and Kristen C Stone and James Donaldson and Sidney D. Nau and James P Soeffing and David M Murray and Kristin W. Lester and Robert Neal Aguillard},
  journal={Sleep},
  year={2006},
  volume={29 2},
  pages={
          232-9
        }
}
STUDY OBJECTIVE Actigraphy, a method of inferring sleep from the presence or absence of wrist movement, has been well validated against polysomnography in trials with people without insomnia. However, the small amount of literature on validation with insomniacs has revealed an actigraphy bias toward overscoring sleep. The current validation trial with insomniacs used the largest number of subjects to date in such research and attracted participants with diverse demographic characteristics… 

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