Kim (1969) noted a father and 2 sons, aged 7 and 11 years, with intermittent episodes of flushing of the ears associated with somnolence. It had its onset in all 3 at about the same time. The mother and another son were unaffected.
Kim, P. M. Familial flushing and somnolence. (Letter) JAMA 210: 1289 only, 1969.