The likeliest answer is that the dimmer switch (the one that controls the brightness of the dash lights at night) was accidentally moved up to it's highest position, when it is set there the interior lights come on. Try moving it down to a lower position and see if that fixes it. If not the switch at one of the doors is broken and thinks it is always on.
My brake lights, dome lights and dash board lights went out at the same time. I checked the fuse under the hood of the car and I can't locate the fuse box inside the car. My questions are (1) what cloud have cause for all three(3) lights to go out at the same time and (2) where inside the car is the fuse box?