Motion sensors in the toilet:

xxx: The motion sensor does not run because the person is sitting there in a stationary state :)
YYY: As a world-renowned expert on this issue, I can see that if a person has come into a stationary state, it’s time to worry.
zzz: And if a person is constantly moving, then they are probably two ;)
zzz: You can put the sensor in the toilet itself, if the light suddenly disappears, then the toilet is busy.