title: Sleep and dream patterns in twins. Markov analysis of a genetic trait.
mesh_terms: D002648:Child; D002940:Circadian Rhythm; D004325:Dreams; D004569:Electroencephalography; D004777:Environment; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D008297:Male; D011247:Pregnancy; D011336:Probability; D012890:Sleep; D012895:Sleep, REM; D014427:Twins