I would check that your little one is getting the correct nutrients, etc.
But I doubts its anything to get worried about. I remember the first time my child stayed awake for more than half the day... I FREAKED out.... though OMG somethings wrong, phoned my mom, phoned my sister, was in an absolute pannic... luckily I didnt waste money at the Pead that time round hahaha
Beinf a First time mom, I used to freak out at almost everything, she would have a slight temperature, and I'd want to rush her off to the pead. It is a scarey thought when you think that your little baby is 100% dependant on you, for food, warmth, love, & care.... but its always comforting to know that there are MILLIONS of woman out there going through the same thing as you.
Just trust your instincts, they are normally right.