The purpose of this study is to develop statistical and informatics tools for analyzing and visualizing Actical™ (actigraphy) data linked to fatigue in Sleep Medicine Center patients.

An Actical™ is a watch-like device attached to the wrist that uses an accelerometer to measure movement nearly continuously over several days. The American Academy of Sleep Medicine practice parameters report that actigraphy is a useful tool for detecting sleep in healthy individuals, assessing specific aspects in insomnia and restless legs syndrome, circadian-rhythm disorders, and excessive sleepiness. Concurrent with these recommendations is an increased interest in the use of actigraphy as a tool for objectively measuring fatigue. With improved high-end statistical methods for analyzing this data, actigraphy has the potential to become more important as an objective diagnostic tool for determining fatigue, sleep abnormalities and assessing response to treatment.

Inclusion Criteria:

• Patient presenting to the Washington University Sleep Medicine Center for evaluation of obstructive sleep apnea syndrome, restless legs syndrome, or insomnia
• Older than 18 years of age
• Ability to consent to participation in the study
• Willingness to wear the Actical™ for two 7 day periods and to return the equipment promptly

Exclusion Criteria:

• Inability to provide valid consent
• Pregnancy
• Night or rotating shift workers

Patients seen in clinic at the Washington University Sleep Medicine Center.