Are you sure there isn't a better way to immobilize your car?
I presume what you are saying is that you want to disable unlocking of doors via radio, during the night.
Can you still get in using your key directly in the door.
Technically you could do something like, build an arduino with both a receiver and a transmitter, and if the receiver detects a signal that looks like pulses from your keyfob, it could turn on a transmitter (on 433Mhz) sending a bunch of random noise, which would probably prevent the receiver in the car getting the full data stream it needs to unlock the doors.
You may however find its easier just to remove the fuse that powers the central locking system.
You could use the Arduino to control a relay to disable the central locking circuit in place of the fuse.
My only concern is that if you lock the doors while driving and the arduino disconnects the power to the doors, you may not be able to exit the case in the case of an accident
So you may be better of just putting a manual switch in series with the fuse (or circuit if you can get to the wires)
BTW. You don't want to run the transmitter in the jammer all the time, because it will interfere with all sorts of other devices e.g. other people's cars, door bells, panic buttons, etc etc etc
Which is why you'd need to have a receiver as well as a transmitter
However I still thing the switch / relay etc is better