Very important issue. There is only one bathroom. I knocked and got no response, so opened the door a crack to see someone's backside. How shall I wake them up? Preferably without embarrassing them, though maybe not as I think it's this woman who put ice cubes down my shirt while I was sleeping this morning. Already tried knocking vigorously.

In other news, I've found out where the mysterious snoring heard all morning is coming from.