You did a good job with being armed and having a gun safe attached to the floor.
I purchased small alarms that I placed on all of my windows and doors. They were $1 each at the Dollar store. They work on a magnet system - a magnet on the frame and the door/window which, when they are detached creates and alarm that is very loud. Total cost under $20 for a secure house.
I also have dogs - may not be a good solution for you but they are loud, can hear much better than me, and are scary to most people.
And you should get a mobile phone or a phone in your bedroom. You should never be separated from your phone or your gun.