6 Week Old Sleeping All Day?

Sarah
My little girl was 6 weeks old on Friday. She has been awake for a combined amount of maybe 2 hours today and it has me worried. I called her pediatrician's on call nurse and she said to wake baby to eat and let her sleep. But this much seems excessive. Any advice or ideas? Dr. Google tells me it could be a growth spurt, but I'm still worried. Thanks, everyone.