Prayer of a sick person who is not able to remove
    impurity
Question

                A man is extremely sick and
      cannot stand or sit, or remove impurity. Does he still have to pray?
Praise be to Allah.He has to pray lying down, and make gestures
    to indicate the rukoo’ (bowing) and sujood (prostration). He should also keep away
    from impurity (najaasah) as much as he can.