@EricIndiana my cat is also obsessed with a lamp. It's a table lamp, and she developed the habit of staring into it, and then ralphing on the table next to it. No idea why.
@EricIndiana I thought that, too, but our house is sealed, and there just aren't any tiny insects. Sometimes we have gotten fruitflies in the kitchen, but never up here in the bedroom. It's just her fascination with the light.