We have been owners at Marriott's Desert Springs II for 19 years. We always lock it off and exchange, but we stay in Villas I and II 3 or 4 times a year on II Getaways. The last 10 years or so we have found the housekeeping staff appears to be setting the in room alarm clock radios for early morning settings. The alarms are usually set in the main unit and the efficiency. It happens far too often to be accidental or something a previous occupant would do. And, it doesn't happen anywhere else we stay. In the past, I emailed the resort twice to let them know this was happening and no one responded each time. I'm just curious if this happens to anyone else staying at Desert Springs. We are here now and it happened again. You would think we would remember to check or unplug the clock radio, but they get us nearly every time we stay. LOL. And, we don't tip when it happens. Let me know if this happens to you. 
I told them to just unplug the alarm clock/radio and if that didn't work, to put it in the refrigerator :rofl: