Interesting stuff http://www.psych.org/pnews/00-10-06/lack.html
Depressed adults can have their symptoms of depression alleviated through having less REM sleep however REM deprivation during feotal development may increase later incidence of depression.
Also the quicker we go into dream sleep the more likely we are to become depressed http://behaviorhealth.org/link_between_ ... _depre.htm