Hi cardinal,
While I’m not as “strict” as many moderators on other forums about topic creep … I generally switch a post to a new topic if it includes comments or information that is outside the main scope of the ori9inal poster’s topic or questions. I probably would have left your post in the original topic if it was only about your pillow (although they weren’t really asking about a pillow) but since it also included your comments about your mattress I thought that it was more appropriate in its own topic.
You are certainly welcome to post your comments and experience about your pillow in a separate topic or in the main pillow topic here 
Phoenix