How the Prophet (peace and blessings of Allaah be upon him) saw in this world some events of the Hereafter
Question

                My Question is if Judgement day has not occurred yet and no one is in
      Hell or Paradise how is it that the Prophet Muhammad (peace and blessing be upon him) saw
      people being punished in Hell already and the prophets, children, and people already in
      Paradise.
Praise be to Allah.How the Prophet 
 (peace and blessings of Allaah be upon
    him) saw in this world some events of the Hereafter
If we believe that Allaah is able to do all things, the matter is easy
    for us, and we believe what the Prophet 
 (peace and blessings of Allaah be upon him) has
    told us. Allaah is the Creator of time and is able to show His Prophet in this world
    things that will happen on the Day of Resurrection, just as He showed him Paradise and
    Hell on the wall when he prayed Salaat al-Kusoof (the eclipse prayer), and he
    almost brought his companions a bunch of grapes from the fruits if Paradise, even though
    the distance between earth and Paradise is so immense. The One Who brought the place near
    is not incapable of doing whatever He wills with regard to time and of showing His Prophet
    in this world living scenes of what will happen on the Day of Resurrection. Your Lord is
    Able to do all things.