Scariest thing ever happened this evening. I picked LO up after work and we went to the store. Well he fell asleep in the cart!! He would cry until he fell asleep. I even picked him up and carried him around the store so he could sleep. That is so not like him. He slept a good 2 hours before we got home and then wouldn't eat his dinner, just cried. He was so limp and would just fall asleep anytime you set him down. I was freaking out and we ended up taking him to the ER where they said nothing was wrong with him

What are some reasons why he could be SO tired and lethargic? He took all his naps today and hasn't been sick at all.