Frail Holocaust survivor Thomas Blatt told a court on Tuesday he still has nightmares about the months he spent at the Sobibor death camp, in moving testimony in the trial of accused Nazi guard John Demjanjuk. Blatt, 82, whose family was killed at Sobibor, was composed but pale. His hands shook and he spoke quietly and with hestitation. At the age of 15, Blatt was ordered to sort out the belongings of Jews sent to the gas chambers at the camp.