OK, the system has been in use for a few days and behaves well.

So I took the opportunity to add the 4 hour SLEEP after the door is operated in order to save battery drain.

However, in sleep mode the current consumed is the same as when it is just left looping the LDR adc.

I know there's a standing current consumed by the 7805 reg but I expected a change when the chip is sleeping that would be measureable?