Don't talk to Myrtle.

"Sorry, Myrtle", you say politely. "I have to finish some work today, so I don't have time to talk at the moment. I'll try to visit you later."

Myrtle looks disappointed, but swoops away to scare a couple of third year students. You walk over to your usual shower head, and see Ron there as well.

"Hey, Harry", Ron says as you hang your towel on a free hook. "I hope you managed to keep out of Myrtle's way."

You take a look around, and, confident that Myrtle is out of earshot, reply.

"She cornered me already, but I got out of it."

Ron chuckles.

"How did you sleep?" you ask your best friend.

"Not well", Ron replies with a sigh. "I kept on having dreams that woke me up."