My husband has left the kitchen light on every night for eleven years. Not all night. Just until I fall asleep. I never questioned it. I'd turn off the bedroom light, get under the covers, and a few minutes later I'd see the thin strip of light under our bedroom door. I assumed he just forgot. Sometimes I'd call out: βYou left the kitchen light on again.β He'd say, βI know.β Then he'd leave it. Last month, he stayed with his brother for four nights...