WTF did I do

check fusible link, near wirewall connectors and brake light switch (on brake pedal lever).
I had same problem, brake light switch came loose and battery empthiet over night.

If you have any loose wires under dash/under hood fix and check them.
cheap multimeter is really good tool to locate electrical gremlings.

http://www.summitracing.com/parts/wmr-w2974/overview/
for example.

A: is where fusible link check that area for burned wires.

B: there you can see some loose wires witch should be covered.

This picture is taken at the time when i did rebuild my wiring, good thing to do if old wiring is starting to go.

there is really good quides/links on FABO to rebuild/improve wiring