Sleeping too much

Can a one yr old sleep too much? It's like he's a new born again. Basically only wakes up to eat, he'll stay awake for a couple hours in between his naps, but naps are like 4 hours long, and the rest of the day/night he just sleeps. It's kinda concerning, like does he not have energy to stay up? He eats really good drinks lots of milk and when he is awake he's not drowsy or anything he's a normal playing baby, but it just seems like he's sleeping always and really is only up for like 8 hours of the day