Had a similar experience at an old company. One of the light switches in server room was placed next to a switch connected to the UPS of certain servers (I have

Had a similar experience at an old company. One of the light switches in server room was placed next to a switch connected to the UPS of certain servers (I have no idea how/why this even came about). Confused the heck out of us when we were trying to figure out why some of our servers went on UPS power randomly at night. Turns out we'd get the notifications on nights the cleaning crew decided to flick the lights off then on again.