This might be a silly question, but my rabbits are in a north facing room and at this time of year it's rather gloomy, so I'm not sure if I should leave the lights on for them while I'm at work, or maybe they are not bothered since they usually get out at twilight anyway? Usually I switch the lights on when I get home and turn them off when I go to bed but I keep wondering on dark mornings whether that's too gloomy for them all day long...