[Janet]

The next time you see her, just come right out and tell her. Just say...."I almost forgot, I wanted to mention something to you. The other night with you had a guest, I don't want to embarass you, but I could hear what was going on and it kept me awake. If you could, I'd really appreciate you trying to keep it a little more quiet, I would really appreciate it".

I think that sounds nice and respectful without coming down like a madwoman. I on the other hand would have walked in their room and thrown some ice water on them, tell them I need my sleep and watched it shrivel up like a prune...lolo