Restless nights?

Hi there! I'm 6 weeks 1 day pregnant and recently I am sleeping really deeply to the point my husband has to wake me up or go care for our 6 month old himself. I have never had this problem. I also kept waking up during the night feeling extremely disoriented after having really intense nightmares. It happened maybe 4 times last night. Then this morning I didn't wake up when my husbands alarm went off and he went to have a shower. I also had black bags under my eyes for the first time ever. I don't remember being like this during my last pregnancy. Is this just extreme fatigue from my pregnancy? Is there anything I can do to feel a little more awake during the day and sleep better?