I've been in hotel rooms with motion sensor activated floor lights. Assuming that you walk to the bed, they stay on for a while--with no off switch--and then turn on again automatically if your feet get near the floor in the middle of the night or even if you kick the edge of some bedding near the floor. It's easy to be frightened wide awake by these things if you're not expecting them even though the light isn't very bright.

I've also noticed some lights around the decorator frame of the bathroom mirror that apparently cannot be turned off. The latest offender was a new Hyatt Regency, but they seem common in Ws, where they're sometimes purple although I've also seen white butterflies.