Expecting constant communication between a maid and the front dest is asking alot.
As has been mentioned above several times---put the "Do not disturb" sign out and if this doesn't work "Get Grumpy"!
Asking a hotel to assume that they know everyones sleep habits, and daily schedule is asking a bit too much, I think.
Returning to a room @ 5 or 6 P.M. and still not having it cleaned is a reason to get "Grumpy". Having the vacuum banging on you door while they're cleaning the carpets in the hall, while chatting with each other @ 7 or 8 A.M. is a reason to get "Grumpy". Listening to the T.V. in the next room for 24 straight hours is a reason to get "GrumpY". Getting upgraded to a "Dipsey Dumster View" is a reason to get "Grumpy". Being required to call M/R's 2 or 3 times to get a stay recorded is a reason to get "Grumpy". Never getting an upgrade is a reason to get "Grumpy". Knowing that you're never gonna get that upgrade is a reason to get "Grumpy". Asking for a possible upgrade, upon arrival, and receiving a response that indicates "beggers never prosper", is a reason to get "Grumpy". Having lost one's health and learning that my wifes days are numbered is a reason to get "Grumpy".
But not putting out a "PLEASE, Do not disturb" sign, and getting knock on the door is a reason to look in a mirror and get "Grumpy"!!!