Battery life

I just got a brand new Macbook Air three days ago and I have noticed that it drains battery very quickly. I went to bed last night with it 75% charged and this morning it was at 8%. Ive also checked the battery life and it says that the battery life is normal. I am not sure if this is normal for a macbook to run out of battery so quickly but I feel like that can't be right. I also have noticed that it sometimes will start to "breathe" very loudly. Anyone know a solution, or should I bring it in for repair?