Is this normal? Murphy has been basically sleeping ALL day. I've gotten him up a couple times (other than potty breaks) to play, but it only lasts about 10 minutes then he heads back to sleep. He even skipped breakfast and has only had a little bit of his lunch. He doesn't seem sick, just super tired. Is he having a growth spurt or something? He did hang out with us outside earlier for about an hour, but was just kind of wandering around the yard watching us work, so he really didn't do much to tire himself out.