Perhaps he's also pissing in my kitchen after he's done with pummeling your plums.
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This is a ground floor? There is no basement?
How old is the building? Does it have a damp-proof membrane?
I'm not doubting your tileing skills, but how level is the floor- if you pour some water elsewhere, does it run to that spot?
I'm thinking, maybe there is a little damp/condensation on the whole floor and it runs to that spot
Spread sheets of newspaper along your floor and identify the source by the starting of a wet path. You may have to check it a few times before you go to bed tho....
1) A wizard did it.
2) Your kitchen is haunted.
3) You sleep walk and piss in the kitchen every night.
Not meaning to pry into your personal hygiene but do you usually shower (not a golden 1) before you go to bed?
Then again if it is a blocked sewage pipe then it might taste a lot worse than piss! !