We’ve had a robot vacuum for a year or so. Recently we inadvertently screwed up the settings and instigated middle-of-the-night cleaning.
Returning from a restroom call around 3:30 this a.m. I spotted its little blue light cruising across the living room floor. I got the control and steered it "home" to the charger. It's sort of fun to "drive" around the house, but not at that hour.
This morning, after looking up the operations manual on the Internet, I managed to disable the automatic program (I hope). The other DrC has a whimsical disquisition on wandering robot vacs at her blog, which I invite you to check out.