Quds city, Jan 16, SPA -- Israeli Prime Minister Ariel Sharon opened his eyes twice on Monday after family members played a tape of his grandson's voice, aides said, raising hopes the 77-year-old stroke victim may be emerging from a coma. But a spokeswoman for Hadassah hospital, where Sharon has been treated since suffering a brain haemorrhage on Jan. 4, said relatives had observed "eyelid movements" whose medical significance was unclear. "(Sharon's son) Gilad brought in a cassette with voice of Rotem, his eldest grandson, speaking to him, and he opened his eyes twice, each time for two or three minutes," one aide said. "They believe it was so short because he is still fuzzy from anaesthesia yesterday," the aide said, referring to the tracheotomy, the insertion of a tube into Sharon's windpipe to help him breathe, that surgeons performed on Sunday. "But the doctors didn't see it, so it is hard to determine whether it is serious or whether they are just getting their hopes up." Doctors have been unsuccessful so far in rousing Sharon since reducing, and then on Saturday stopping, sedatives used to induce a coma aimed at stopping his brain from swelling. In another sign Israel is moving quickly to fill the political vacuum left by Sharon, his new Kadima party named interim Prime Minister Ehud Olmert as acting chairman to lead it into a March 28 general election, according to a report of Reuters.