First night in grave

As everything has the starting point so in the same way has some ending also so is the life. We believe that one day we will die because this life is not eternal what is eternal is the life after that life which is called perpetual life.  But before stating that life one has to pass some time in the grave is called life in the grave.  In Islamic view this is a part of religion and people believe in this belief.

 One has to spend several days and night in grave before moving into the judgment day. But the first night in the grave has real importance it will define in which way one has to spend life in the grave. It is believed that when their loved one buried him under the tons of mud and started to go back to their houses in the mean while angels come and they ask a different question from the person. The first question they ask who is the creator of you and if he spend life according to the principals of Allah and his prophet Hazrat Muhammad (SAW) then he will give all the answer right and an angel said him go to the sleep without worries and fear and they order the grave in the name of their master mean Allah to widen up and nice gentle breeze starts to blow from the heaven and this is the beginning of the reward which the God Almighty has promised with is obedient person. And if one has not passed the life according to the principals and the code of the God then angel order the earth to crush the person and he will remain in this state until or unless God Almighty raise him. 

There is a Hadith about the grave life. "Seek Allah’s protection from the Punishment of the Grave, since punishment of the Grave is a fact/true." [At-Tabraanee]