Originally Posted by
MSPeconomist
I have, many times, and not in Vegas. I'm convinced that some hotel managements tell their housekeepers to do this.
I've been lucky. The time it does happen to me, I come back late and/or too tired and forget to put up DND sign. They should respect the DND and privacy of the guest, but in their defense, sometimes guests just leave the sign up and never or forget to take it off. So they may be just checking to see if the guest have left yet, which I assume is more prevalent on check-out days.