A child remains in Stage IV for about an hour or two. After that she undergoes a brief arousal. This partial waking may last for only a few seconds or up to several minutes. Her brain waves change abruptly, showing a mixture of patterns from deep sleep, light sleep, drowsiness, and waking. She will probably move about, perhaps rubbing her face, chewing, turning over, crying a little, or speaking unintelligibly. She may even open her eyes for a moment with a blank stare or sit up briefly before returning to sleep. Occasionally, and briefly, she may even wake fully before the progression of
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