Aziraphale, thank you for chiming in! I did not remember exactly who listed "sleep" as an interest, but now we all know. Mystery solved. And as you can see from other comments here, you have actually inspired others to read and adjust profiles as well as to think about sleep!
Jenni, I remember the avatar thread. I read many of the comments there, but not all - they were so many ... And again, it would be much easier to find information about someone's avatar name in the profile than in a long thread.