Done both of those (well, not actually poured the water over me, just knocked it over; the umistakeable noise woke me up).

On Wednesday morning I woke up in my hotel room in London, to find the saucer (which I'd been using as an ashtray) on the floor near the bed, wet with a yellowish/brownish liquid in it, and a large wet pool on the carpet surrounding it. Looking at it, I had this distant, dreamlike memory of standing up, holding the saucer in one hand and saying to myself "oops, that's too much, it's going all over the floor", and of carefully laying the saucer on the floor, but I had no conscious, clear memory of what had happened. However, I do recall going to bed thinking "I think I need a pee, but not that much, it'll wait until morning".
I reckon I must have sleepwalked out of bed and gone for a pee in the saucer. Which is strange, as it's the first time I've done anything like that (with exception of the bed-moving instance which I related in the comments several posts ago). Sorry, that is yucky stuff.

By the way, Tom, what did you think of the MP3s?