EASTERN District residents yesterday called for flights leaving Hong Kong at night to take off over Kowloon City to relieve noise at their homes. They claimed the arrangement of forcing night flights taking the Lei Yue Mun route to land and take off had stripped them of their right ''to have a good sleep''. Five representatives of the Heng Fa Chuen Owners' Committee put their complaints to officials yesterday and urged the Government not to lift the flight curfew at Kai Tak Airport. No flights are allowed between midnight and 6.30 am and all arriving and departing flights must take the Lei Yue Mun route between 9 pm and midnight. But the Government may relax the restrictions following calls from the International Air Transport Association and Hong Kong Tourist Association. The associations believe the move would help ease the congested air traffic. Eastern District Board member and Heng Fa Chuen resident Chao Shing-kie said: ''We are against lifting the ban. The Government could ease the air traffic at night by allowing flights to use the Kowloon City route to leave.'' The Civil Aviation Department promised it would consider the suggestions.