Make it stop!

So I'm trying to work on my stupid research paper thing last night (and read fanfiction because I have the attention span of a goldfish when it comes to working) when I head this beep come from somewhere. First I thought I was imagining it but then I hear it again. I go to the kitchen to investigate because it sounds like the smoke alarm and I was worried that maybe I had forgotten to turn off the stove or something.

I wait in the kitchen for the next beep after making sure that nothing is actually burning anywhere. Finally I hear the noise again (the annoying part is that it only beeps like every 20 seconds or so) and it's coming from down the hall and not from the kitchen like I had thought. So I follow it and I already have a bad feeling about the whole thing and when I hear the sound again I'm proven right.

The beeping is coming from my flatmate's room, which is locked because she left to go somewhere on Friday. Apparently she is really aware of fire safety and has a smoke alarm in her room and now it's running out of battery and is making that beeping sound so you notice and switch the damn thing. And she's not here! And I have had to listen to the beeping ever since and it's driving me up the wall!  /0\