Battery dead after night parking

Hi all,
I just got a '97 mondeo 1.8 verona, and for the first 2 weeks everything was fine, then all of a sudden the indicators go off on their own after I've locked up for the night. In the morning I try to start the car and the windscreen wipers go for a count of 3 and the starter motor clicks away, without turning the engine.
Once started, the car runs fine all day, starting every time, even if I've left it parked up for hours.
[i]Come the next morning, nothing again ![/i]
I've made sure everything is off (as much as possible), but the indicators come on and go off with a clicking noise whenever they want to during the night, so now I've been disconnecting the battery as a last resort.
Any help would be much appreciated, thanx.