N'DJAMENA, Nov 29 (Reuters) - The Chadian government accused Sudan on Thursday of backing Chadian rebels to try to block the deployment in eastern Chad of a European Union peacekeeping force tasked by the United Nations to protect refugees. "(Sudanese President) Omar Hassan al-Bashir is losing sleep over the arrival of the U.N. and EU forces ... He wants to stop the force from coming, because he thinks this force, which will be on the Chadian border, constitutes a danger to him," Chadian Prime Minister Nouradine Delwa Kassire Coumakoye told reporters. (Reporting by Stephanie Hancock; Editing by Pascal Fletcher)