Greater day-to-day variability in sleep measures indicative of insomnia

A monitoring device indicated that greater variability from day to day across multiple sleep measurements may be a defining trait of chronic insomnia, according to a study published in JMIR Formative Research. “To our knowledge, this is the longest naturalistic observation of sleep in patients with insomnia,” Devon A. Hansen, PhD, LMHC, an assistant professor at Washington State University, told

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