A weird thing is happening in my home. There is a battery operated toy. It has no plug, it sits on a table. Whenever I turn the lights on above the toy, it sings. Just regular recessed ceiling lights on a dimmer switch. When I turn the lights off, it stops. The other lights in the room do not affect it. How is this light switch controlling the toy ? It is not a coincidence. If I hold the toy in my hand under the lights, it still does it. What is happening ?