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"Dogs are infamous for their frequent napping habits.  While naps are quite normal for domestic dogs, sometimes excessive daytime sleepiness is caused by a medical condition called narcolepsy.  Narcolepsy is a syndrome in which the sleep-wake cycle is disrupted, causing tiredness, lethargy and brief periods of muscle paralysis or unconsciousness."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Narcolepsy/Symptoms.aspx>