I could be wrong, but I think it maybe a reference to years ago when coppers would be asked to stop partying neighbours, reminding them it was late and to get their lights off and to bed.
….my immediate thought about candles was linking back to the Blitz when wardens made sure there were no chinks of light for the bombers to see.
Lyrics from the 60s often relate to WW2 because it was so fresh in the minds.