Dreaming of grave is a bad sign as per dream meaning and interpretation. The dream means disruption to current lifestyle. It also suggests bad health or death of near one. Dreams of grave are a warning sign regarding an upcoming problem.
Dream of grave and you only see your friends and relatives and not yourself means you will face death like situation in near future.
Dream of grave and you see lot of resting places of dead people means you will resign from life. You will think of committing suicide. It is like you no longer will have the energy and courage to face problems of life. The dream is asking you to be mentally prepared to face life.
For some reason you dream of grave and you are happy or laughing means death of your enemies. It also means you will make bold and high risk decisions in life but sadly it will be suicidal and will not give you any gains.