Ftm 5 weeks old

Is it normal for a newborn to sleep more than normal some day? Usually shes awake and alert most of the day with cat naps here and there but today shes basically been sleeping the entire day even putting herself to sleep. I've made sure to feed her every 3-4 hours and she'll drink the whole bottle as long as Im sure to keep her awake through it. She has been battling a cold as well.