Interesting responses.
FUD's comment is the most telling.
I live near the inner city. Trust me at 2.30am, when you are woken by broken glass you can't tell if it a window in your house, a car window on the street or as is it most often, people breaking bottles on the street. either they're drunk and drop them or they are kids who place them in the streets so cars will drive over them.
[or even the stack of dishes beside the sink has finally given away to gravity
]
You need to find a balance between walking into a dangerous situation and building trenches in the bedroom every time there is a strange noise.
If I did this I would never get any sleep.
In the above situation, I could just about go back to sleep. I am in the bedroom [it has a solid core door and is locked and has sitting beside it a bar that is wedged between the floor and the door.] In the situation described above all the things of value are in the room with me. If it is a BG and they steal the TV, who really cares, I claim on insurance and buy a new one.
A similar situation occured to me last Wednesday. Was working late in the office [9pm] and I heard noises from the ground floor of our small two storey building. I went to investigate and found two individuals smashing into the building through an external wall with chisels.
What did I do, Ran away from the situation, switched the lights off [I know the layout of the office], fired off the monitored alarm system, went upstairs while dialing the police on my cell-phone.
What did they do ? as soon as we saw each other I ran away, they ran full speed in the opposite direction. I guess in that situation it wasn't a false alarm.