So when puppies are overtired their bodies release adrenaline, which means they start being hyper and bitey! It sounds a bit crazy, cause you would think, if they are tired, they will be calm and sleepy, but it is quite the opposite. Hence naps are very important. Puppies usually stay up for one hour at a time and then nap.
sure, use the kong! Good to get them used to them.
Mhm, sneezing would not be caused by tiredness.