Lights On, Lights Off

For some reason I always turn off lights when I enter a room and I find myself turning them on as I leave. Mostly I feel I don't need light so I turn them off to save electricity. When I have a smashing headache it lessens the pain to have dim light or total darkness but then I don't want to leave the house dark for my husband or dog or cat. They need the light to get around so I turn the lights back on as I am leaving.