Early morning migraine. Nocturnal plasma levels of catecholamines, tryptophan, glucose, and free fatty acids and sleep encephalographs - Hsu,L.KG.; Crisp,A.H.; Kalucy,R.S.; Koval,J.; Chen,C.N.; Carruthers,M.; Zilkha,K.J. (Lancet, 1977)