A dog will go through various stages of activity and restfulness during the day, spending about 50% of its time in a sleep stage, about 30% in a restful state, and about 20% of its time in an active and fully awake state. Of its time spent sleeping, the dog is only in REM sleep for about 10% of the time. Because the dog spends less time in the deepest stage of sleep, the average dog needs more four to six hours more sleep than the average human.
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