Narcolepsy is a sleep disorder that causes excessive sleepiness and frequent daytime sleep attacks. Although it is often lampooned in movies it is a very debilitating disorder which is not very well understood. Cataplexy is a symptom of narcolepsy which causes a sudden weakness brought on by excitement or strong emotions. As you can see in the following video, it is when the dog gets excited that it loses muscle strength and falls asleep. It is worth a look.
-Sleep Guy
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