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. 2007 Aug 15;3(5):479–488.

Figure 1.

Figure 1

Conceptualization of possible time-series differences between Normal Controls and Primary Insomnia Patients: During Wakefulness, Non-REM Sleep, and the Sleep Onset Process. Heuristic model for possible abnormalities in sleep/wake processes in primary insomnia. Insomnia patients may exhibit greater fluctuations during sleep/wake states, or exhibit more sluggish and irregular state transitions.