Lights Dimming

One day while at work the crew I was subbing on had a call about dimming lights. We checked voltage at the meter, 123/123/246. We knocked on the door and an elderly lady answers. She asked us to come in and watch for the lights to dim, so we obliged the invite. After 10minutes or so of nothing we told her if further problems persist to call us and we'd hang a recorder. She then replied " My husband is the one complaing, ever since he had a stoke we just can't figure out why everything is getting darker to him he's in good health." God watch over this couple...