A car interior light can drain the battery when accidentally left on - even if a LED lamp is used (here represented by the 100 Ohm resistor and the LED).
This circuit shuts the current off after about 8 minutes, with only 2.5 mA left.
Turning the switch off again resets the circuit wthin 3-4 seconds, unloading the capacitor through the two diodes and the 4.7k Ohm resistor.
For the 2 transistors a BC516 darlington may be used.
