In the hotels I frequent, it is not "standard procedure" for cleaning staff to walk in when the customer is sleeping. Cleaning staff know which rooms are occupied and which are not.
At the Tarntawan there is no "Do not disturb" sign to hang on the door.
There is a push-button electronic "sign" outside the door but in all my years I've stayed here it has never worked.
The staff want me to fit into their schedule. Sorry, I'm paying so they fit into mine. The manager told me the staff are in attendance all day, so any time during the day should be ok.
I used to give them a generous tip, but anyone who knocks on the door at 9 am gets nothing.