2 month old sleeping so much?

So I know life is overwhelming for them right now and they're growing so it's expected that he's tired, but the last week or so he will eat about 11am, go to sleep, then wake back up around 5/6pm. He'll partially wake up and I'll try to interact with him to get him going but he'll nod off again within 10-15min. He's also sleeping through the night, so he's packing in about 15/16 out of 24hrs of sleep is this ok? He's not jaundice and no fever.