Praying at the cemetery in a dream indicates that the person who sees the dream falls into the troubles of others, sacrifices himself for their happiness and well-being, and this starts to hurt himself. The dreamer is so engrossed in helping others that he will soon be in need of help.
It means that the person who sees that he is praying at the cemetery in his dream is unhappy and sad because he is very emotional and well-intentioned. It indicates that the person who sees the dream is sensitive enough to bear the troubles and pains of others, and therefore cannot experience true happiness.