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Updated February 19, 2014

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This technique uses a small instrument called an actigraph worn on the wrist or ankle to measure body movement. It creates a pattern based on activity that is useful in assessing sleep-wake cycles across many consecutive days and nights. It is useful for assessing advanced and delayed sleep phase disorders.

The actigraphy showed that she actually sleeps more than she thought.
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  5. Sleep Glossary A - E
  6. Definition of Actigraphy

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