Works well but DRAINS battery

I love this app and I know that it really has helped me wake up every morning...but my phone shouldnt be at 50% at 9 am. When I get in to my car which supports Bluetooth and connects automatically, every morning I jump in my car it looks as if its calling my phone? Once I close out of the app it stops immediately... What is it monitoring while I sleep? Is this what drains my battery. Would love for it to not take up that much space for something I need to simply wake me up.

Jamerson09 about Kiwake: smart alarm clock