Hotel invades client privacy

My room nº 1212 at Amberton hotel, L. Stuokos-Guceviciaus 1, LT-01122 Vilnius, Lithuania was equipped with a motion sensor mounted in the top corner of the room in front of my bed, which lighted up every time I moved around the room or changed my position in bed. I admit fire and smoke sensors are needed for safety and security reasons; however, I can't see any safety benefits from a motion sensor - the hotel already knows I am in the room if I have used my electronic key to enter. I would like to be informed, therefore, what are the security and safety benefits I am reaping at the cost of this invasion of my privacy.