Many people doubt the fact that people in the grave are going through severe punishments or enjoying a peaceful stay. This is due to the reason that when a grave is dug, we do not see any fire burning people or gigantic snakes biting dead bodies. All we see are bones mixed with soil. Well, then where is the punishment or peace? Whether we can see it or not, the promise of Allah is true. Allah gave us many things to understand things better. He tells us that there are signs in His creations for those who think. To understand this particular issue (grave) better, we can examine our dreams. Say, a person is sleeping right beside you. He is seeing a dream where some people are trying to kill him. They catch him and starts beating him. Finally, they take out a gun and shoots him. You are sitting beside this sleeping individual, but you do not see any of these things. However, he is experiencing all these things, it's just you cannot see. The same way, that individual in the grave is going through all the things that are promised by Allah, it's just we cannot see.