the flat above us has an old lady.. i don't really know what goes on at night, but most mornings, i'll find my window covered with wet tissue papers. well, when it's wet, it kinda sticks onto ur window that kind, so in the morning it's already hardened on my window. lol. so most mornings i had to scrub my window. it's irritating, but it's an old lady afterall. nothing i can do. haizz..