Since this happens when he is overtired, I would start incorporating scheduled daily nap times. Crate him in a quiet area so he can get some more sleep during the day. Puppies need to sleep a lot - people get so worried about not exercising or stimulating their pup enough and forget to build quiet times into the day.
Gryffon Vom Wildhaus
BH, OB1, TR1, AD
Rottweiler/Hairy Dog mix?? 2004-2015