Good. Everyone expected it, but it is nice to have it tested and confirmed. Makes life easier and research cheaper.
Measuring Movement To Assess And Manage Sleep Disorders:

Actigraphy, the use of a portable device that records movement over extended periods of time, and has been used extensively in the study of sleep and circadian rhythms, provides an acceptably accurate estimate of sleep patterns in normal, healthy adult populations and in-patients suspected of certain sleep disorders, according to practice parameters published in the April 1st issue of the journal SLEEP.

This means that patients can go about their normal lives instead of checking into a sleep lab. They just need to wear the “watch” at all times and bring/send in the data on a regular basis.

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