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<p>who live or sleep alone are often unaware of the condition. Symptoms may persist for years or even decades without identification. During that time, the person may become conditioned to the daytime sleepiness, headaches, and <a href="page.php?w=Fatigue_%28medical%29">fatigue</a> associated with significant levels of sleep disturbance. Obstructive sleep apnea has been associated with neurocognitive morbidity, and there is a link between snoring and neurocognitive disorders.</p>

<p><big>Classification</big></p>
<p>In the third edition of the <a href="page.php?w=International_Classification_of_Sleep_Disorders">International Classification of Sleep Disorders</a></p><p>
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