I found an article that suggests that Remeron increases sleep quality and does not affect REM sleep. The abstract is here:

http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract

I'm sorry I don't know how to make it a link.

When I took Remeron my doc told me that it was called REMeron because it improved sleep. (It didn't help my sleep, but did help my anxiety).

Good luck.