Woops haha did you not herthe beeping as you were getting out of the car this morning, shouldnt really cause it problems just the once but if you kept draining it should. On my old corsa c my sub drained my battery a good few times which resulted in me killing the battery
Gave it about twenty minutes down the motorway, nah no noise when I got out it was only the sidelights I left on... When I tried to open it at dinner the alarm went off and a bit of horn! Had to open with the key When I put the key in the ignition the dash just started flashing, I was crapping myself till I saw the lights were on!