[Blacklizt]

actually every hotel has ghost
the reason why they knock the door before entering is meant they will excuse themself entering the room, in a polite way, so ghost wont disturbing them....
in all of case, all is depend on each individual, if they are physically and mentally strong, they wont be disturbed
if you find out you are being disturbed inside the hotel rooms
try to put the shoes you are wearing on the floor at the end of your bed with 1 side up and 1 side down
someone taught me those things