Tired puppies can also get very irritable and snappy, just like over-tired children.  Giving them time out to sleep, with frequent rest periods throughout the day, will usually result in softer mouthing and a more thoughtful approach. 

Puppies frequently get over-tired if there are children in the household who may be keeping a very young puppy actively awake and engaged well past the time when it would normally have been resting and sleeping.  Putting the puppy into a quiet room for periods of time out when it is tired, and before it gets over-tired, will make it less likely to become careless with its teeth when playing. 

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