DBH and myalgic encephalomeyelitis/chronic fatigue syndrome: NREMS time increased in response to CFS for Dbh+ mice; t = 7.7; p < 0.001), without changing in Dbh− mice (t = 1.2, N.S.)so that NREMS times, like wake times, did not differ between CFS Dbh+ and CFS Dbh− mice (t = 1.6, N.S.).