Lights Randomly Turning On at Night?

I have 14 lights in my setup, and lately, some of them will randomly turn on for no explainable reason. It tends to happen at night when it's the most terrifying. It can't be the result of some delayed reaction either, because for instance I have 5 bulbs in a kitchen chandelier that are grouped together, and just one of the bulbs in the chandelier randomly turned itself on in the middle of the night recently. They are usually either all on our all off, but never controlled individually, so it makes no sense to me.

Also the other night my bedroom lights spontaneously turned on in the middle of the night. My girlfriend almost refused to continue sleeping in the bedroom.

It's pretty freaky. Why on Earth would this be happening?