Haven't had that problem, but wouldn't it be easier to just take a look at your brake fluid level and pads?
When I read your post the first thing that I thought of was a loose e-brake cable...
Regardless, I wouldn't waste any time in resolving this issue. Your brakes are a major safety device ya know!
Can't check in the dark :-) But I will first thing in the morning. I doubt it's the e-brake cable cause of the beeps and flashing of the light.
I also just looked in the manual. It says that when the brake light comes on there is an audible warning (beeps). I'm thinking the rear pads have worn out. I know the front are practically new and dust like crazy, but I have no idea about the rears. I have no idea about the previous maintenance of this car so i'm definitely going to do this right.