A blurb that’s just coming out into the press.
Slow wave activity (SWA), a stable trait dependent marker of the intensity of non-rapid eye movement (NREM) sleep, is lower in young healthy African-Americans compared to Caucasians who were matched for age, gender and body weight, according to recent research.
It would be interesting to see the full report on this, whether subjects were matched on social and economic scales, and whether other health issues played a factor.
Update: Apparently there was a big sleep convention lately. Here were some other findings: