mine stopped responding to the key fob the other day but when i used the key in the door a few times it started responding again so i think it was something to do with the position of the drivers door button.
if you have nothing when you put the key in the ignition , ie it wont turn, then i would be looking at a possible battery drain over night, try jumping it using the correct procedure to see if it comes back to life that is assuming that somebody hasnt stuck chrome / colour coded door handles over the keyhole which you will have to remove first